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PHP
TOP 100
INTERVIEW QUESTIONS & ANSWERS
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What's PHP?
2
QUESTION
The PHP Hypertext Preprocessor is ...
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What Is a Session?
3
QUESTION
A session is a logical obje...
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What is meant by PEAR in PHP?
4
QUESTION
PEAR is short fo...
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What is the difference between $message and $$message?
5
...
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What Is a Persistent Cookie?
6
QUESTION
A persistent cook...
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What does a special set of tags <?= and ?> do in PHP?
7
Q...
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How can we repair a MySQL table?
8
QUESTION
The syntex fo...
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What is the difference between mysql_fetch_object and
mys...
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How can we encrypt the username and password using PHP?
1...
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What is the functionality of the function strstr and stri...
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Echo vs. print statement.
12
QUESTION
echo() and print() ...
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Explain the different types of errors in PHP.
13
QUESTION...
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Explain the importance of the function htmlentities.
14
Q...
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What is MIME?
15
QUESTION
MIME - Multi-purpose Internet M...
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Why PHP is also called as Scripting language?
16
QUESTION...
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Why many companies are switching their current business l...
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What is the difference between PHP and JavaScript?
18
QUE...
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What is difference between require_once(), require(), inc...
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PHP being an open source is there any support available t...
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How can we increase the execution time of a php script?
2...
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Who is the father of PHP ?
22
QUESTION
Rasmus Lerdorf is ...
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In how many ways we can retrieve the data in the result s...
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What are the differences between Get and post methods.
24...
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How can we create a database using PHP and MySQL?
25
QUES...
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What is use of header() function in php ?
26
QUESTION
The...
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What is meant by nl2br()?
27
QUESTION
Inserts HTML line b...
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How can we encrypt and decrypt a data present in a MySQL ...
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What are the differences between procedure-oriented langu...
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What are the differences between public, private, protect...
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Which programming language does PHP resemble to?
31
QUEST...
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What is the actually used PHP version and the latest vers...
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What is the main difference between PHP 4 and PHP 5?
33
Q...
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Is multiple inheritance supported in PHP?
34
QUESTION
PHP...
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How comparison of objects is done in PHP5?.
35
QUESTION
W...
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What is the use of the function ‘imagetypes()’?
36
QUESTI...
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How is it possible to set an infinite execution time for ...
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How can we get second of the current time using date func...
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How can we access the data sent through the URL with the ...
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How can we access the data sent through the URL with the ...
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How is it possible to return a value from a function?
41
...
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How is the ternary conditional operator used in PHP?
42
Q...
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What does $GLOBALS means?
43
QUESTION
$GLOBALS is associa...
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What does $_SERVER means?
44
QUESTION
$_SERVER is an arra...
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What does $_FILES means?
45
QUESTION
$_FILES is an associ...
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How can we change the maximum size of the files to be upl...
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What does $_ENV means?
47
QUESTION
$_ENV is an associativ...
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What does $_COOKIE means?
48
QUESTION
$_COOKIE is an asso...
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What the difference between the ‘BITWISE AND’ operator an...
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What is the difference between ereg_replace() and eregi_r...
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What is the meaning of a final class and a final method?
...
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What is needed to be able to use image function?
52
QUEST...
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Is it possible to destroy a cookie?
53
QUESTION
Yes, it i...
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How is it possible to know the number of rows returned in...
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Which function gives us the number of affected entries by...
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How can we check the value of a given variable is alphanu...
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What does the unlink() function means?
57
QUESTION
The un...
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What does the unset() function means?
58
QUESTION
The uns...
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What is the most convenient hashing method to be used to ...
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Are Parent constructors called implicitly inside a class ...
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When sessions ends?
61
QUESTION
Sessions automatically en...
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What is the difference between Exception::getMessage and
...
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What is the difference between for and foreach?
63
QUESTI...
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Is it possible to submit a form with a dedicated button?
...
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Is it possible to protect special characters in a query s...
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Is it possible to use COM component in PHP?
66
QUESTION
Y...
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Will comparison of string "10" and integer 11 work in PHP...
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When are you supposed to use endif to end the conditional...
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How do I find out the number of parameters passed into fu...
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What is the difference between characters 23 and x23?
70
...
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What’s the difference between htmlentities() and htmlspec...
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How can we display information of a variable that is huma...
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What is the function file_get_contents() used for?
73
QUE...
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How can we check if the value of a given variable is a nu...
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How do I escape data before storing it into the database?...
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How is it possible to remove escape characters from a str...
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Is it possible to remove the HTML tags from data?
77
QUES...
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What’s the difference between __sleep and __wakeup?
78
QU...
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How is it possible to propagate a session id?
79
QUESTION...
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What is the default session time in php?
80
QUESTION
The ...
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What is MVC?
81
QUESTION
MVC- Model, View, Controller - i...
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What is Polymorphism?
82
QUESTION
It's simply the idea th...
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What are the different types of CSS you can add in a page...
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What functions are used to get the image size, Width and ...
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How do you upload videos using PHP & MySQL?
85
QUESTION
W...
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Explain the changes in PHP versions?
86
QUESTION
Rasmus L...
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How can we get the browser properties using PHP?
87
QUEST...
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How to find current date and time?
88
QUESTION
The date()...
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How can we know the total number of elements of Array?
89...
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What is the maximum length of a table name, a database na...
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What are magic methods?
91
QUESTION
Magic methods are the...
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How can we know the number of days between two given date...
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What is a PHP File?
93
QUESTION
Those files which contain...
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Why we use PHP over other languages?
94
QUESTION
We use P...
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What is the main problem arising when you assign a variab...
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If the variable $b is equal to 5 and variable $c is equal...
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With a heredoc syntax, do you get variable substitution i...
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Explain mysql_error()?
98
QUESTION
The mysql_error() mess...
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How do we define at Constant?
99
QUESTION
Constant in PHP...
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What is the use of "ksort" in php?
100
QUESTION
It is use...
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How to delete a file from the system?
101
QUESTION
Unlink...
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List of Resources
102
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PHP
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INTERVIEW QUESTIONS & ANSWERS
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Top 100 PHP Questions and Answers

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What are the top 100 PHP Interview Questions and Answers in 2014? Based on the most popular PHP questions asked in interview, we've compiled a list of the 100 most popular PHP interview questions in 2014.

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Top 100 PHP Questions and Answers

  1. 1. www.hirist.com PHP TOP 100 INTERVIEW QUESTIONS & ANSWERS
  2. 2. For the hottest PHP jobs, please visit www.hirist.com hirist.com What's PHP? 2 QUESTION The PHP Hypertext Preprocessor is a programming language that allows web developers to create dynamic content that interacts with databases. PHP is basically used for developing web based software applications. ANSWER QUESTION 1
  3. 3. For the hottest PHP jobs, please visit www.hirist.com hirist.com What Is a Session? 3 QUESTION A session is a logical object created by the PHP engine to allow you to preserve data across subsequent HTTP requests. There is only one session object available to your PHP scripts at any time. Data saved to the session by a script can be retrieved by the same script or another script when requested from the same visitor. Sessions are commonly used to store temporary data to allow multiple PHP pages to offer a complete functional transaction for the same visitor. ANSWER QUESTION 2
  4. 4. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is meant by PEAR in PHP? 4 QUESTION PEAR is short for "PHP Extension and Application Repository" and is pronounced just like the fruit. The purpose of PEAR is to provide: A structured library of open-sourced code for PHP users, A system for code distribution and package maintenance A standard style for code written in PHP , The PHP Foundation Classes (PFC), The PHP Extension Community Library (PECL), A web site, mailing lists and download mirrors to support the PHP/PEAR community. PEAR is a community-driven project with the PEAR Group as the governing body. The project has been founded by Stig S. Bakken in 1999 and quite a lot of people have joined the project since then. ANSWER QUESTION 3
  5. 5. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between $message and $$message? 5 QUESTION They are both variables. But $message is a variable with a fixed name. $$message is a variable who's name is stored in $message. $user = 'bob' is equivalent to $holder = 'user'; $$holder = 'bob'; ANSWER QUESTION 4
  6. 6. For the hottest PHP jobs, please visit www.hirist.com hirist.com What Is a Persistent Cookie? 6 QUESTION A persistent cookie is a cookie which is stored in a cookie file permanently on the browser's computer. By default, cookies are created as temporary cookies which stored only in the browser's memory. When the browser is closed, temporary cookies will be erased. You should decide when to use temporary cookies and when to use persistent cookies based on their differences: *Temporary cookies can not be used for tracking long-term information. *Persistent cookies can be used for tracking long-term information. *Temporary cookies are safer because no programs other than the browser can access them. *Persistent cookies are less secure because users can open cookie files see the cookie values. ANSWER QUESTION 5
  7. 7. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does a special set of tags <?= and ?> do in PHP? 7 QUESTION The output is displayed directly to the browser. ANSWER QUESTION 6
  8. 8. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we repair a MySQL table? 8 QUESTION The syntex for repairing a mysql table is: REPAIR TABLE tablename REPAIR TABLE tablename QUICK REPAIR TABLE tablename EXTENDED This command will repair the table specified. If QUICK is given, MySQL will do a repair of only the index tree. If EXTENDED is given, it will create index row by row ANSWER QUESTION 7
  9. 9. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between mysql_fetch_object and mysql_fetch_array? 9 QUESTION MySQL fetch object will collect first single matching record where mysql_fetch_array will collect all matching records from the table in an array ANSWER QUESTION 8
  10. 10. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we encrypt the username and password using PHP? 10 QUESTION You can use the MySQL PASSWORD() function to encrypt username and password. For example INSERT into user (password, ...) VALUES (PASSWORD($password”)), ...); ANSWER QUESTION 9
  11. 11. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the functionality of the function strstr and stristr? 11 QUESTION strstr() returns part of a given string from the first occurrence of a given substring to the end of the string. For example: strstr("user@example.com","@") will return "@example.com". stristr() is idential to strstr() except that it is case insensitive. ANSWER QUESTION 10
  12. 12. For the hottest PHP jobs, please visit www.hirist.com hirist.com Echo vs. print statement. 12 QUESTION echo() and print() are language constructs in PHP, both are used to output strings. The speed of both statements is almost the same. echo() can take multiple expressions whereas print cannot take multiple expressions. Print return true or false based on success or failure whereas echo doesn't return true or false. ANSWER QUESTION
  13. 13. For the hottest PHP jobs, please visit www.hirist.com hirist.com Explain the different types of errors in PHP. 13 QUESTION Notices, Warnings and Fatal errors are the types of errors in PHP Notices: Notices represents non-critical errors, i.e. accessing a variable that has not yet been defined. By default, such errors are not displayed to the user at all but whenever required, you can change this default behavior. Warnings: Warnings are more serious errors but they do not result in script termination. i.e calling include() a file which does not exist. By default, these errors are displayed to the user. Fatal errors: Fatal errors are critical errors i.e. calling a non-existent function or class. These errors cause the immediate termination of the script. ANSWER QUESTION
  14. 14. For the hottest PHP jobs, please visit www.hirist.com hirist.com Explain the importance of the function htmlentities. 14 QUESTION The htmlentities() function converts characters to HTML entities. This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities. ANSWER QUESTION
  15. 15. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is MIME? 15 QUESTION MIME - Multi-purpose Internet Mail Extensions. MIME types represents a standard way of classifying file types over Internet. Web servers and browsers have a list of MIME types, which facilitates files transfer of the same type in the same way, irrespective of operating system they are working in. A MIME type has two parts: a type and a subtype. They are separated by a slash (/). MIME type for Microsoft Word files is application and the subtype is msword, i.e. application/msword. ANSWER QUESTION
  16. 16. For the hottest PHP jobs, please visit www.hirist.com hirist.com Why PHP is also called as Scripting language? 16 QUESTION PHP is basically a general purpose language, which is used to write scripts. Scripts are normal computer files that consist of instructions written in PHP language. It tells the computer to execute the file and print the output on the screen. PHP is used for webpages and to create websites, thus included as scripting language. ANSWER QUESTION
  17. 17. For the hottest PHP jobs, please visit www.hirist.com hirist.com Why many companies are switching their current business language to PHP? Where PHP basically used? 17 QUESTION PHP is rapidly gaining the popularity and many companies are switching their current language for this language. PHP is a server side scripting language. PHP executes the instructions on the server itself. Server is a computer where the web site is located. PHP is used to create dynamic pages and provides faster execution of the instructions. ANSWER QUESTION
  18. 18. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between PHP and JavaScript? 18 QUESTION The difference lies with the execution of the languages. PHP is server side scripting language, which means that it can‟t interact directly with the user. Whereas, JavaScript is client side scripting language, that is used to interact directly with the user.. ANSWER QUESTION
  19. 19. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is difference between require_once(), require(), include()? 19 QUESTION require() includes and evaluates a specific file, if the file is not found then it shows a Fatal Error. require_once() includes only the file which is not being included before. It is used to be recommended for the files where you have lots of functions stored. include() includes the file, even if the file is not found, but it gives a warning to the user to include(). ANSWER QUESTION
  20. 20. For the hottest PHP jobs, please visit www.hirist.com hirist.com PHP being an open source is there any support available to it? 20 QUESTION PHP is an open source language, and it is been said that it has very less support online and offline. But, PHP is all together a different language that is being developed by group of programmers, who writes the code. There is lots of available support for PHP, which mostly comes from developers and PHP users. ANSWER QUESTION
  21. 21. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we increase the execution time of a php script? 21 QUESTION By the use of void set_time_limit(int seconds) Set the number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 seconds or, if it exists, the max_execution_time value defined in the php.ini. If seconds is set to zero, no time limit is imposed. When called, set_time_limit() restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out. ANSWER QUESTION
  22. 22. For the hottest PHP jobs, please visit www.hirist.com hirist.com Who is the father of PHP ? 22 QUESTION Rasmus Lerdorf is known as the father of PHP. ANSWER QUESTION
  23. 23. For the hottest PHP jobs, please visit www.hirist.com hirist.com In how many ways we can retrieve the data in the result set Of MySQL using PHP? 23 QUESTION We can do it by 4 Ways 1. mysql_fetch_row. , 2. mysql_fetch_array , 3. mysql_fetch_object 4. mysql_fetch_assoc ANSWER QUESTION
  24. 24. For the hottest PHP jobs, please visit www.hirist.com hirist.com What are the differences between Get and post methods. 24 QUESTION There are some difference between GET and POST method 1. GET Method have some limit like only 2Kb data able to send for request But in POST method unlimited data can be send 2. when we use GET method requested data show in url but Not in POST method so POST method is good for send sensitive Request ANSWER QUESTION
  25. 25. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we create a database using PHP and MySQL? 25 QUESTION We can create MySQL database with the use of mysql_create_db("Database Name") ANSWER QUESTION
  26. 26. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is use of header() function in php ? 26 QUESTION The header() function sends a raw HTTP header to a client. We can use herder() function for redirection of pages. It is important to notice that header() must be called before any actual output is seen.. ANSWER QUESTION
  27. 27. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is meant by nl2br()? 27 QUESTION Inserts HTML line breaks (<BR />) before all newlines in a string. ANSWER QUESTION
  28. 28. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we encrypt and decrypt a data present in a MySQL Table using MySQL? 28 QUESTION AES_ENCRYPT () and AES_DECRYPT () ANSWER QUESTION
  29. 29. For the hottest PHP jobs, please visit www.hirist.com hirist.com What are the differences between procedure-oriented languages and object-oriented languages? 29 QUESTION There are lot of difference between procedure language and object oriented like below: a.Procedure language easy for new developer but complex to understand whole software as compare to object oriented model b.In Procedure language it is difficult to use design pattern mvc, Singleton pattern etc but in OOP you we able to develop design pattern c. IN OOP language we able to re-use code like Inheritance, polymorphism etc but this type of thing not available in procedure language on that our Fonda use COPY and PASTE. ANSWER QUESTION
  30. 30. For the hottest PHP jobs, please visit www.hirist.com hirist.com What are the differences between public, private, protected, static, transient, final and volatile? 30 QUESTION Public: Public declared items can be accessed everywhere. Protected: Protected limits access to inherited and parent classes (and to the class that defines the item). Private: Private limits visibility only to the class that defines the item. Static: A static variable exists only in a local function scope, but it does not lose its value when program execution leaves this scope. Final: Final keyword prevents child classes from overriding a method by prefixing the definition with final. If the class itself is being defined final then it cannot be extended. transient: A transient variable is a variable that may not be serialized. volatile: a variable that might be concurrently modified by multiple threads should be declared volatile. Variables declared to be volatile will not be optimized by the compiler because their value can change at any time. ANSWER QUESTION
  31. 31. For the hottest PHP jobs, please visit www.hirist.com hirist.com Which programming language does PHP resemble to? 31 QUESTION PHP syntax resembles Perl and C ANSWER QUESTION
  32. 32. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the actually used PHP version and the latest version? 32 QUESTION Version 5 is the actually used version of PHP. The latest stable version of PHP is 5.5.14 released at 27 June 2014. ANSWER QUESTION
  33. 33. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the main difference between PHP 4 and PHP 5? 33 QUESTION PHP 5 presents many additional OOP (Object Oriented Programming) features. ANSWER QUESTION
  34. 34. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is multiple inheritance supported in PHP? 34 QUESTION PHP includes only single inheritance, it means that a class can be extended from only one single class using the keyword „extended‟. ANSWER QUESTION
  35. 35. For the hottest PHP jobs, please visit www.hirist.com hirist.com How comparison of objects is done in PHP5?. 35 QUESTION We use the operator „==‟ to test is two object are instanced from the same class and have same attributes and equal values. We can test if two object are refering to the same instance of the same class by the use of the identity operator „===‟. ANSWER QUESTION
  36. 36. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the use of the function ‘imagetypes()’? 36 QUESTION imagetypes() gives the image format and types supported by the current version of GD-PHP. ANSWER QUESTION
  37. 37. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is it possible to set an infinite execution time for PHP script? 37 QUESTION The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to not have the PHP error „maximum execution time exceeded‟.It is also possible to specify this in the php.ini file. ANSWER QUESTION
  38. 38. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we get second of the current time using date function? 38 QUESTION $second = date("s"); ANSWER QUESTION
  39. 39. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we access the data sent through the URL with the GET method? 39 QUESTION In order to access the data sent via the GET method, we you use $_GET array like this: www.url.com?var=value $variable = $_GET["var"]; this will now contain „value‟ ANSWER QUESTION
  40. 40. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we access the data sent through the URL with the POST method? 40 QUESTION To access the data sent this way, you use the $_POST array. Imagine you have a form field called „var‟ on the form, when the user clicks submit to the post form, you can then access the value like this: $_POST["var"]; ANSWER QUESTION
  41. 41. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is it possible to return a value from a function? 41 QUESTION A function returns a value using the instruction „return $value;‟. ANSWER QUESTION 40
  42. 42. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is the ternary conditional operator used in PHP? 42 QUESTION It is composed of three expressions: a condition, and two operands describing what instruction should be performed when the specified condition is true or false as follows: Expression_1 ? Expression_2 : Expression_3; ANSWER QUESTION 41
  43. 43. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does $GLOBALS means? 43 QUESTION $GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script. ANSWER QUESTION 42
  44. 44. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does $_SERVER means? 44 QUESTION $_SERVER is an array including information created by the web server such as paths, headers, and script locations. ANSWER QUESTION 43
  45. 45. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does $_FILES means? 45 QUESTION $_FILES is an associative array composed of items sent to the current script via the HTTP POST method. ANSWER QUESTION 44
  46. 46. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we change the maximum size of the files to be uploaded? 46 QUESTION We can change the maximum size of files to be uploaded by changing upload_max_filesize in php.ini. ANSWER QUESTION 45
  47. 47. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does $_ENV means? 47 QUESTION $_ENV is an associative array of variables sent to the current PHP script via the environment method. ANSWER QUESTION 46
  48. 48. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does $_COOKIE means? 48 QUESTION $_COOKIE is an associative array of variables sent to the current PHP script using the HTTP Cookies. ANSWER QUESTION 47
  49. 49. For the hottest PHP jobs, please visit www.hirist.com hirist.com What the difference between the ‘BITWISE AND’ operator and the ‘LOGICAL AND’ operator? 49 QUESTION $a and $b: TRUE if both $a and $b are TRUE. $a & $b: Bits that are set in both $a and $b are set. ANSWER QUESTION 48
  50. 50. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between ereg_replace() and eregi_replace()? 50 QUESTION The function eregi_replace() is identical to the function ereg_replace() except that it ignores case distinction when matching alphabetic characters. ANSWER QUESTION 49
  51. 51. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the meaning of a final class and a final method? 51 QUESTION „final‟ is introduced in PHP5. Final class means that this class cannot be extended and a final method cannot be overrided. ANSWER QUESTION 50
  52. 52. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is needed to be able to use image function? 52 QUESTION GD library is needed to be able execute image functions. ANSWER QUESTION
  53. 53. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is it possible to destroy a cookie? 53 QUESTION Yes, it is possible by setting the cookie with a past expiration time. ANSWER QUESTION
  54. 54. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is it possible to know the number of rows returned in result set? 54 QUESTION The function mysql_num_rows() returns the number of rows in a result set. ANSWER QUESTION
  55. 55. For the hottest PHP jobs, please visit www.hirist.com hirist.com Which function gives us the number of affected entries by a query? 55 QUESTION mysql_affected_rows() return the number of entries affected by an SQL query. ANSWER QUESTION
  56. 56. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we check the value of a given variable is alphanumeric? 56 QUESTION It is possible to use the dedicated function, ctype_alnum to check whether it is an alphanumeric value or not. ANSWER QUESTION
  57. 57. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does the unlink() function means? 57 QUESTION The unlink() function is dedicated for file system handling. It simply deletes the file given as entry. ANSWER QUESTION
  58. 58. For the hottest PHP jobs, please visit www.hirist.com hirist.com What does the unset() function means? 58 QUESTION The unset() function is dedicated for variable management. It will make a variable undefined. ANSWER QUESTION
  59. 59. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the most convenient hashing method to be used to hash passwords? 59 QUESTION It is preferable to use crypt() which natively supports several hashing algorithms or the function hash() which supports more variants than crypt() rather than using the common hashing algorithms such as md5, sha1 or sha256 because they are conceived to be fast. hence, hashing passwords with these algorithms can vulnerability. ANSWER QUESTION
  60. 60. For the hottest PHP jobs, please visit www.hirist.com hirist.com Are Parent constructors called implicitly inside a class constructor? 60 QUESTION No, a parent constructor have to be called explicitly as follows: parent::constructor($value) ANSWER QUESTION
  61. 61. For the hottest PHP jobs, please visit www.hirist.com hirist.com When sessions ends? 61 QUESTION Sessions automatically ends when the PHP script finishs executing, but can be manually ended using the session_write_close(). ANSWER QUESTION
  62. 62. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between Exception::getMessage and Exception::getLine ? 62 QUESTION Exception::getMessage lets us getting the Exception message and Exception::getLine lets us getting the line in which the exception occurred. ANSWER QUESTION
  63. 63. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between for and foreach? 63 QUESTION for is expressed as follows: for (expr1; expr2; expr3) statement The first expression is executed once at the beginning. In each iteration, expr2 is evaluated. If it is TRUE, the loop continues and the statements inside for are executed. If it evaluates to FALSE, the execution of the loop ends. expr3 is tested at the end of each iteration. However, foreach provides an easy way to iterate over arrays and it is only used with arrays and objects. ANSWER QUESTION
  64. 64. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is it possible to submit a form with a dedicated button? 64 QUESTION It is possible to use the document.form.submit() function to submit the form. For example: <input type=button value=”SUBMIT” onClick=”document.form.submit()”> ANSWER QUESTION
  65. 65. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is it possible to protect special characters in a query string? 65 QUESTION Yes, we use the urlencode() function to be able to protect special characters. ANSWER QUESTION
  66. 66. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is it possible to use COM component in PHP? 66 QUESTION Yes, it‟s possible to integrate (Distributed) Component Object Model components ((D)COM) in PHP scripts which is provided as a framework. ANSWER QUESTION
  67. 67. For the hottest PHP jobs, please visit www.hirist.com hirist.com Will comparison of string "10" and integer 11 work in PHP? 67 QUESTION Yes, internally PHP will cast everything to the integer type, so numbers 10 and 11 will be compared. ANSWER QUESTION
  68. 68. For the hottest PHP jobs, please visit www.hirist.com hirist.com When are you supposed to use endif to end the conditional statement? 68 QUESTION When the original if was followed by : and then the code block without braces. ANSWER QUESTION
  69. 69. For the hottest PHP jobs, please visit www.hirist.com hirist.com How do I find out the number of parameters passed into function? 69 QUESTION func_num_args() function returns the number of parameters passed in. ANSWER QUESTION
  70. 70. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the difference between characters 23 and x23? 70 QUESTION The first one is octal 23, the second is hex 23. ANSWER QUESTION
  71. 71. For the hottest PHP jobs, please visit www.hirist.com hirist.com What’s the difference between htmlentities() and htmlspecialchars()? 71 QUESTION htmlspecialchars only takes care of <, >, single quote „, double quote " and ampersand. htmlentities translates all occurrences of character sequences that have different meaning in HTML. ANSWER QUESTION
  72. 72. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we display information of a variable that is human readable in PHP? 72 QUESTION print_r() can be used to be able to display a human-readable result. ANSWER QUESTION
  73. 73. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the function file_get_contents() used for? 73 QUESTION The file_get_contents() function lets you read content from a file and store the content into a string variable. ANSWER QUESTION
  74. 74. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we check if the value of a given variable is a number? 74 QUESTION Using is_numeric() function this can be checked. ANSWER QUESTION
  75. 75. For the hottest PHP jobs, please visit www.hirist.com hirist.com How do I escape data before storing it into the database? 75 QUESTION addslashes function enables us to escape data before storage it into the database. ANSWER QUESTION
  76. 76. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is it possible to remove escape characters from a string? 76 QUESTION The stripslashes function enables us to remove the escape characters before apostrophes in a string. ANSWER QUESTION
  77. 77. For the hottest PHP jobs, please visit www.hirist.com hirist.com Is it possible to remove the HTML tags from data? 77 QUESTION Yes. The strip_tags() function enables us to clean a string from the HTML tags. ANSWER QUESTION
  78. 78. For the hottest PHP jobs, please visit www.hirist.com hirist.com What’s the difference between __sleep and __wakeup? 78 QUESTION __sleep returns the array of all the variables that needs to be saved, while __wakeup retrieves them. ANSWER QUESTION
  79. 79. For the hottest PHP jobs, please visit www.hirist.com hirist.com How is it possible to propagate a session id? 79 QUESTION It is possible to propagate a session id via cookies or URL parameters. ANSWER QUESTION
  80. 80. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the default session time in php? 80 QUESTION The default session time in php is until the browser is closed. ANSWER QUESTION
  81. 81. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is MVC? 81 QUESTION MVC- Model, View, Controller - is simply a way of organizing your code into 3 separate layers each with their own job. Model - Usually contains data access code and all of you business logic code. View - Contains markup/design code, generally html,xml, json. Controller - Usually contains very little code, just whatever is needed to call the Model code and render the View code. ANSWER QUESTION
  82. 82. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is Polymorphism? 82 QUESTION It's simply the idea that one object can can take on many forms. So in PHP OOP one class "cars" may have two classes that extend it, for example a "Honda" class and a "BMW" class. ANSWER QUESTION
  83. 83. For the hottest PHP jobs, please visit www.hirist.com hirist.com What are the different types of CSS you can add in a page? 83 QUESTION There are three types of CSS that can be added in a page. 1. External CSS. 2. Internal CSS. 3. Inline CSS. ANSWER QUESTION
  84. 84. For the hottest PHP jobs, please visit www.hirist.com hirist.com What functions are used to get the image size, Width and Height? 84 QUESTION getimagesize () to get the size of an image Imagesx () to get width of an image Imagesy () to get height of an image. ANSWER QUESTION
  85. 85. For the hottest PHP jobs, please visit www.hirist.com hirist.com How do you upload videos using PHP & MySQL? 85 QUESTION We just need to copy the path of stored videos in the database rather than storing the videos files itself. All videos will be saved on a different folder and videos can be called from that folder when ever required. Default size is 2 mb for video files but we can change that size from max_file size option in php.ini file. ANSWER QUESTION
  86. 86. For the hottest PHP jobs, please visit www.hirist.com hirist.com Explain the changes in PHP versions? 86 QUESTION Rasmus Lerdorf is known as the father of PHP.PHP/FI 2.0 is an early and no longer supported version of PHP. PHP 3 is the successor to PHP/FI 2.0 and is a lot nicer. PHP 4 is the current generation of PHP, which uses the Zend engine under the hood. PHP 5 uses Zend engine 2 which, among other things, offers many additional OOPs features. ANSWER QUESTION
  87. 87. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we get the browser properties using PHP? 87 QUESTION By using $_SERVER[‟HTTP_USER_AGENT‟] variable. ANSWER QUESTION
  88. 88. For the hottest PHP jobs, please visit www.hirist.com hirist.com How to find current date and time? 88 QUESTION The date() function provides you with a means of retrieving the current date and time, applying the format integer parameters indicated in your script to the timestamp provided or the current local time if no timestamp is given. In simplified terms, passing a time parameter is optional - if you don't, the current timestamp will be used. ANSWER QUESTION
  89. 89. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we know the total number of elements of Array? 89 QUESTION sizeof($array_var) count($array_var) If we just pass a simple var instead of a an array it will return 1. ANSWER QUESTION
  90. 90. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the maximum length of a table name, a database name, or a field name in MySQL? 90 QUESTION Database name: 64 characters Table name: 64 characters Column name: 64 characters ANSWER QUESTION
  91. 91. For the hottest PHP jobs, please visit www.hirist.com hirist.com What are magic methods? 91 QUESTION Magic methods are the members functions that is available to all the instance of class Magic methods always starts with "__". Eg. __construct All magic methods needs to be declared as public To use magic method they should be defined within the class or program scope Various Magic Methods used in PHP 5 are: __construct() __destruct() __set() __get() __call() __toString() __sleep() __wakeup() __isset() __unset() __autoload() __clone() ANSWER QUESTION 90
  92. 92. For the hottest PHP jobs, please visit www.hirist.com hirist.com How can we know the number of days between two given dates using PHP? 92 QUESTION $date1 = date("Y-m-d"); $date2 = "2006-08-15"; $days = (strtotime($date1) - strtotime($date2)) / (60 * 60 * 24); ANSWER QUESTION 91
  93. 93. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is a PHP File? 93 QUESTION Those files which contain text, HTML, JavaScript code, and PHP code are known as PHP files. The default file extension of PHP files is “.php ANSWER QUESTION 92
  94. 94. For the hottest PHP jobs, please visit www.hirist.com hirist.com Why we use PHP over other languages? 94 QUESTION We use PHP language over other languages beacuse PHP language runs on different platforms like Windows, Linux, Unix, Mac OS X, etc. It is also compatible on all servers like Apache, IIS, etc. ANSWER QUESTION 93
  95. 95. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the main problem arising when you assign a variable having value 0123 and it shows a different number (value)? 95 QUESTION The number begins with 0 is treated as octal by the interpreter in PHP language. That‟s why it gives the different number. ANSWER QUESTION 94
  96. 96. For the hottest PHP jobs, please visit www.hirist.com hirist.com If the variable $b is equal to 5 and variable $c is equal to character b, what’s the value of $$a? 96 QUESTION The value of $$a is equal to 100. It is the reference to existing variable. ANSWER QUESTION 95
  97. 97. For the hottest PHP jobs, please visit www.hirist.com hirist.com With a heredoc syntax, do you get variable substitution inside the heredoc contents? 97 QUESTION Yes, you get the variable sunstitution inside the heredoc contents with a heredoc syntax. ANSWER QUESTION 96
  98. 98. For the hottest PHP jobs, please visit www.hirist.com hirist.com Explain mysql_error()? 98 QUESTION The mysql_error() message will tell us what was wrong with our query, similar to the message we receive at the MySQL console ANSWER QUESTION 97
  99. 99. For the hottest PHP jobs, please visit www.hirist.com hirist.com How do we define at Constant? 99 QUESTION Constant in PHP are defined using define() directive, like define(MYCONSTANT”,100); ANSWER QUESTION 98
  100. 100. For the hottest PHP jobs, please visit www.hirist.com hirist.com What is the use of "ksort" in php? 100 QUESTION It is used for sort an array by key in reverse order. ANSWER QUESTION 99
  101. 101. For the hottest PHP jobs, please visit www.hirist.com hirist.com How to delete a file from the system? 101 QUESTION Unlink() deletes the given file from the file system. ANSWER QUESTION 100
  102. 102. For the hottest PHP jobs, please visit www.hirist.com hirist.com List of Resources 102 http://careerride.com/PHP-Interview-Questions.aspx http://www.slideshare.net/vineetkumarsaini/top-100-php-interview-questions-and-answers http://career.guru99.com/top-100-php-interview-questions-answers/ http://www.itechaleart.com/2013/05/top-100-php-interview-questions-answers_10.html http://www.techinterviews.com/php-interview-questions-and-answers http://careerbaba.in/2014/06/php-interview-questions-answers-top-100/ http://www.woodstitch.com/resources/php-interview-questions.php http://www.phpchandigarh.com/top-php-job-interview-questions-answers-2014/ http://www.imatrixsolutions.com/blog/freshers-php-technical-interview-questions-answers http://www.imatrixsolutions.com/blog/Freshers-Latest-PHP-Technical-Interview-Questions-Answers http://w3schools.invisionzone.com/index.php?showtopic=50490 http://todaycut.com/php-interview-questions/ http://placement.freshersworld.com/power-preparation/technical-interview-preparation/php- interview-questions-24321 http://phpinterviewquestions.co.in/ http://letsknowit.com/php-questions http://techpreparation.com/computer-interview-questions/php-interview-questions- answers4.htm#.U_cwEvldVK0
  103. 103. www.hirist.com PHP TOP 100 INTERVIEW QUESTIONS & ANSWERS

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