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A brief description about php and how it works on web server.
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Prepared by:
Chandan DasB.Tech 5th SemesterDept of CSECIT , KOKRAJHAR
INTRODUCTION• It is an interpreted, server-side scripting language.
• Originally designed for web development.
• Similar languages are Perl, ASP.NET, Ruby, JSP (Java Server Pages)
• Embedded into HTML
• Can use DB (MySQL, Oracle, Microsoft SQL, PostgreSQL)
PHP stands for??
Personal Home Page
• Began in 1994 by Rasmus Lerdorf
• Soon he named PHP/FI to build simple, dynamic web applications.
• In 1995 -the release of PHP/FI as "Personal Home Page Tools (PHP Tools) version 1.0".
• In 1997 Zeev Suraski and Andi Gutmans rewrote the parser and formed the base of PHP 3, changing the name PHP: Hypertext Preprocessor.
• On May,2000, PHP 4 was released,
• On July , 2004, PHP 5 was released, powered by the new Zend Engine II.
• In 2008 PHP 5 became the only stable version under development.
• Finally after a vote the current version released in 2014 .
HISTORY
SCRIPTING LANGUAGE
• A scripting language is:– cross-platform since interpreter is easy to port– implicit variable declaration – compiled on demand– Extending – Glue programming
SCRIPTING LANGUAGE
HOW PHP WORKS??
<?php
?>
BASIC PHP SYNTAX
• All variables in PHP start with a $ sign symbol.
• Variables may contain strings, numbers, or arrays.
<html>
<body>
<?php $txt="Hello World"; echo $txt;
?>
</body>
</html>
VARIABLES IN PHP
• String– 'My name is x.'– "My name is $name."
• Boolean• Integer• Floating point• Array
– $a=array("tokyo", "hanoi", "london")– $a=array("japan" => "tokyo", "vietnam" =>
"hanoi", "england" => "london")– $a[2]– $a["vietnam"]
DATA TYPES$name=“x”
• String literals (constants) enclosed in double quotes “ ” or single quotes ‘ ’
• Within “”, variables are replaced by their value: – called variable interpolation. “My name is $name, I think”
• Strings are concatenated (joined end to end) with the dot operator “key”.”board” == “keyboard”
STRING HANDLING
Syntax
if (condition)
code to be executed if condition is true;
else
code to be executed if condition is false;
THE IF...ELSE STATEMENT
Syntax
switch (expression)
{
case label1: code to be executed if expression = label1; break;
case label2: code to be executed if expression = label2; break;
default: code to be executed if expression is different from both label1 and label2;
}
THE SWITCH STATEMENT
• Strlen();
• Strcmp();
• Date();
• Time();
• Include();
• Require();
PHP FUNCTION
• It is used to help web applications to maintain their state across several HTTP requests when needed.
• Cookies
• Session
STATE MANAGEMENT
• Better option of cookie
• Store information about a user. They are available only for a particular application and hold information of only one single user.
SESSION
Syntax:
<?php start_session(); ?>
<?php start_session();
$_SESSION[‘user_name’]=‘’
$_SESSION[‘pwd’]=‘’
?> //create a session
select username,password
From table
Where username=‘textbox1’ and password=‘textbox2’
<?php start_session();
$_SESSION[‘user_name’]=
$_SESSION[‘pwd’]=
if(isset($_SESSION[‘username’]))
Echo “Welcome”. $_SESSION[‘name’]
?> //retrieve a session
• session_destroy();
• unset();
<?php start_session();
$_SESSION[‘user_name’]=
if(isset($_POST[“lgt_btn"]))
unset($_SESSION[‘user_name’]);
?> Name of the Logout button
– Support for MySQL, Oracle, dbm, DB2, PostgreSQL
– Can connect to any database which provides an ODBC driver (Open Database Connectivity Standard) – e.g. MS Access.
– Supported on Windows, Mac OS X, other Unix-like systems (e.g. Linux).
– Similar syntax and features as C++ and Java.
– PHP designer,Wampp/Xampp are free of cost.
FEATURES OF PHP
• Wikipedia
• Google images
• www.w3schools.com
REFERENCES
THANK YOU
