This document provides an overview of frequently asked PHP interview questions and their answers. It begins with introducing the website Coding Tag as an e-learning resource for technical tutorials and interview preparation. The document then lists and explains 4 common PHP interview questions: 1. The constant() function is used to return the value of a constant, even if its name is stored in a variable or returned by a function. 2. NULL is a special constant with a single value of NULL that evaluates to FALSE and returns no value from functions like isset(). 3. The foreach loop iterates through array elements, assigning each value to a variable and moving the array pointer with each iteration. 4. String concatenation uses

1. PHP Interview
Question
By: Coding Tag

2. ABOUT US
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3. What is the purpose of constant() function?
According to the name, this function return the value of the constant. but you don’t know its
name, i.e. It is stored in a variable or returned by a function.
<?php
define("MINSIZE", 50);
echo MINSIZE;
echo constant("MINSIZE"); // same as the previous statement
?>

4. What is NULL?
NULL is a one special type with one and only value stored in it is : NULL.It is a special
constant that is capitalized by convention, but actually it is case insensitive .
$my_var = null;
Variable assigned NULL has the following properties:-
▰ It evaluates to FALSE in a Boolean context.
▰ It returns FALSE when tested with IsSet() function.

5. Explain the syntax for ‘foreach’ loop.
The foreach loop statement is used to loop in arrays values ,for
each value of the current array element is assigned to $value and
the array pointer move one by one .So after that next element is
allowed to process.
foreach (array as value)
{
code to be executed;
}

6. How to concatenate to strings?
To concatenate two string variables together, use the dot (.) operator.
<?php
$string1="Hello World";
$string2="444";
echo $string1 . " " . $string2;
?>
This will produce following result −
Hello World 444

7. 7
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