Php technical presentation

By dharmendra kumar dhakar
Roll no:12115029
NIT RAIPUR

Introduction
Php is stands for php: hypertext pre-processor
Widely used open source scripting language
Server-side scripting language
Embedded with html
 current version of php is 5.5.15 released on 24
july 2014.

What is scripting language
 Scripting languages abstract their users from variable
types and memory management
 no need to compile
 A scripting language is usually interpreted from source
code to bytecode

Server side scripting
 it is a technique used in web design
 involves embedding script in html source code
 before respond to client , server execute server –side
script and produce equivalent HTML code
 server side scripting is different from client side
scripting. For example javascript runs on brower.

Importance of php in web development
open source
Cross platform architecture
 Intergated with a wider range of database like oracle
mysql ,ms access etc.
It supports various servers like Apache ,IIS etc.
Aache is best suited for executing PHP scripts

PHP program structure
<?php
//php code goes here
?>
 “.php” is default file extension for PHP
 PHP file contains PHP scripting code and HTML tags

Variables in PHP
 Used for storing value
 Can hold any type of value, no data type
 Starts with $ sign and preceded by name of
variable
 name of variable are case sensitive

Built in variable
$_GET-used for retrieving form element ,also used
for fetching value of variable through URL
 $_POST:-HTTP post variable used for retrieving form
element
$_SESSION :-used for creating session variable
$_COOKIE :-used for cookie manipulation

Combining HTML and PHP
<html>
<head></head>
<body>
<?php
echo “hello”;
?>
</body>
</html>

PHP functions
 function keyword is used to create a function
 Syntax
function fun_name(parameter){
//some code
return some_value;
}

PHP ‘include’ and ‘requir’
 used to include content of one file into another
Syntax
<?php include “header.php”;
//some code
include “footer.php”
?>

PHP array
 special variable that can hold multiple values at a time
 Indexed array: array with numeric index
 Associative array: element are accessed by keys instead of
numeric index
 multidimensional array: An array that can contain
another array as value
 array() function is used to create an array cont…

PHP array
 syntax
$arr=array(1,2,3,4,5); //indexed array
$arr=array(1=>2,4=>6,5=>7)//associative array
$a=array(1=>array(1,2,3,4,5))//multidimentiona
l

PHP arrays
 foreach loop:-special loop used for arrays
 syntax to access array element
foreach($arr as $value){
echo $value; //for indexed array
}
 to access element of associative array

PHP array
foreach($arr as $key=>$value)
{
echo “value at”.$key.”is”.$value;
}
 array_pop() function is used to delete the last
element of an array

MYSQL
 Mysql is a database and defines structure for storing
information.
 MYSQL is used to perform database related
operation.
 Can be integrated with php.
 open source database server.

Connecting to mysql
 In PHP connection is established using mysql_connect()
function
 syntax:
mysql_connect(servername,username,database
password);
example:-
<?php
$ conn=mysql_connect(“localhost”,”root”,””)
// some code
?>

Closing MYSQL connection
connection use the mysql_closeTo close the () function
 example
<php $db=mysql_connect(“localhost”,”root”,””);
if(!$db) die(“cannot connet to mysal”);
else
//some code
mysql_close($db);
?>

session
 contains information about same user between different
web pages for a particular application
 session_start() function is used to start session
 $_SESSION variable is used to create session variable
<?php session_start()
$_SESSION[‘uname’]=“shyam”;
?>

session
 session_destroy() function is use to destroy session variable
<?php
session_start();
$_SESSION[‘uname’]=$_POST[‘name’];
// some code
session_destroy() //destroy the session
?>

cookie
 often used to identify user
 cookie is a small file which server embeds on user’s system
 whenever same system request a webpage it sends cookie
too
 creating a cookie
setcookie(‘name’,value’,expire,path,domain,security)

cookie
 $_COOKIE variable is used to retrieve cookie
<?php setcookie(“name”, ”shyam” date()+12*60*60);
echo $_COOKIE[‘name’];
?>
 session is better option of cookie

Php technical presentation

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