INTRODUCTION to php.pptx

CONTENTS
• > INTRODUCTION
• > ORIGINS AND USES OF PHP
• > OVERVIEW OF PHP
• > WHAT CAN PHP DO
• > HOW PHP WORK
• > WHAT WILL YOU NEED
• > PHP INSTALLATION
• > PHP SYNTAX
• > BASIC CODE SYNTAX
• > VARIABLES
• > STRING VARIABLE IN PHP
• > PHP VARIABLES
• > VARIABLES NAME
• > OUTPUTS
• > CONTROL STATEMENT
• > PHP EXAMPLES

INTRODUCTION
• * PHP stands for PHP: Hypertext Preprocessor
• * PHP is a server-side scripting language, like ASP
• * PHP scripts are executed on the server
• * PHP supports many databases (MySQL, Informix,
Oracle, Sybase, Solid etc.
• * PHP is an open source software (OSS).

ORIGINS AND USES OF PHP
• > Origins
• - Rasmus Lerdorf – 1994.
• - Developed to allow him to track visitors to his Web
site.
> PHP is an open-source product.
• > PHP is an acronym for Personal Home Page, or PHP
: Hypertext Preprocessing, and database access.

OVERVIEW OF PHP
• •> PHP is a server-side scripting language , like ASP
• •> PHP scripts are executed on the server
• •> PHP supports many databases (MySQL, Informix, Oracle, Sybase, etc.
• •> PHP is an open-source software (OSS)
• •> What is a PHP File?
• - PHP files may contain text, HTML tags and scripts
• - PHP files are returned to the browser as plain HTML
• - PHP files have a file extension of “.php” ,”php3” , or “.Phtml”

WHAT CAN PHP DO?
• > Query a database
• > Allow users to upload files
• > Create/read files on the server (for example, the files
that you users upload)
• > Have a “members area” (i.e via a login page)
• > Have a shopping cart

HOW PHP WORK?
• PHP is a server-side language that means the code
written in php resides on a host computer called a
server. The server sends Web pages to the requesting
visitors (you , the client ,with your web browser)

WHAT WILL YOU NEED?
• •> A web server application (Apache, Xitami , or
IIS)
• •> PHP
• •> My SQL
• •> Web Browser
• •> Text editor, PHP-capable WYSIWYG application
(Adobe Dreamweaver / Kompozer / Amaya) or IDE
(integrated development environment)
• •> FTP application if using a remote server

PHP INSTALLATION
• You need to install web server before you install PHP.
• There are many different web servers available to choose
from, so you need to choose which one you prefer.
• Two of the more popular web services are:
• > Apache
• > internet Information Services (IIS)

PHP SYNTAX
• The PHP syntax on C , Java, and peral , creating a PHP
file is similar to creating an HTML file. In fact, most
PHP files are a mixture of PHP code and HTML.
To create a PHP file , simply do the following:
1. Create a new file in your favorite editor
2. Type some PHP code
3. Save the file with a .php extension

BASIC CODE SYNTAX
<?
PHP Code In
Here
?>
<?php
PHP Code In
Here
php?>
<script
language=“php>
PHP code In
Here
</script>
<html>
<head>
<title>PHP Syntax Example</title>
</head>
<body>
<?php
Echo “PHP is easy!”;
?>
</body>
</html>

VARIABLES
> Variables are used to storing values, like text strings,
number of arrays.
• > When a variable is declared , it can be used over
and over again in your script.
• >All variables in PHP start with a $ sign symbol.
• > The correct wat of declaring a variable in PHP:
$var _ name = value;

STRING VARIABLES IN PHP
• String variable are used for values that contains
characters.
• <?php
$txt=“Hello World ;
echo $txt;
?>

PHP VARIABLES
• A variable can have a short name (like x and y) or a more descriptive name (ages, carn
• total_volume).
• Rules for PHP variables:
• > A variable starts with the $ sign, followed by the name of the variable.
• > A variable name must start with a letter or the underscore character.
• > A variable name cannot start with a number.
• > A variable name can only contain alpha-numeric characters and underscores
(A-z, 0-9, and_).
> Variable names are case-sensitive ($age and $ AGE are two different variables.

PHP VARIABLES
• <?php
• $variable1= 2;
• $variable 2 = 9;
• $variable3 = $variable1 + $variable2;
• echo $variable3;
• ?>

VARIABLES NAME
• Variable names can only contain alpha-numeric
characters and underscore (i.e a-z, A-Z, 0-9, or _)
• Variables names must not contain spaces. For multi-
word variable names , either separate the words with
an underscore ( _ ) or use capitalization.

OUTPUTS
• Output from a PHP scripts is HTML that is sent to the browser.
• HTML is sent to the browser through standard output .
• There are three ways to produce output: echo, print, and printf.
• - echo and print take a string, but will coerce other value to strings
echo
• “Test” , “None” ; #More than one parameter acceptable echo (“first
<br />”
• $sum) # More than one, so ILLEGAL! Print “welcome to my site!”; #
Only
• one printf –same like C
• PHP code is placed in the body of an HTML document

OUTPUTS
• <html>
• <head><title> Trivial php example </title>
• </head>
• <body>
• <?php
• print “welcome to my site1”;
• ?>
• </body>
• </html>

CONTROL STATEMENT
• > Control Expressions
• - Relational operators – same as Javascript (including === and ! ==)
• - Boolean operators – same as perl (two sets, && and and, etc.)
• > Selection statements
• - if, if-else, elseif
• - switch – as in C
• The switch expression type must be integer, double, or string
• - While- just like C
• - do-while – just like C
• - for – just like C
• - foreach – discussed later
• - break - in any for, foreach, while, do-while, or switch
• - continue – in any loop

CONTROL STATEMENTS
• <?php
• $a = 7;
• $b = 7;
• if ($a == $b) {
• $a = 3 * $a;
• ?>
• <br />At this point, $a and $b are equal <br />
• So, we change $a to three times $A
• <?php
• }
• ?>

PHP EXAMPLES
• The following example prints the text “Hello World”
five times:
• <html>
• <body><?php
• for ($=1; $<=5; $i++)
• {
• echo “Hello world!<br />”;
• }
• ?></body>
• </html>

PHP EXAMPLES
• The following example will output “Have a nice weekened! “ if the current
day is Friday , otherwise it will output “Have a nice day!” :
• <html>
• <body><?php
• $d=date(“D”);
• If ($d ==“Fri”)
• Echo “Have a nice weekened”;
• Else
• Echo “Have a nice day!”;
• ?></body>
• </html

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