1. introduction to php and variable

INTRODUCTION TO PHP
Source: Pensyarah Uitm Jasin, Melaka

OUTLINE
Introduction to Server Side Script01
Introduction to PHP02
Variables and Data Types03

How Server Side Script Works
Your Text Here
request
response
Web browser/Client Server
run server side
script
run the script
generate HTML
code
Database
maybe get some
data from database

Introduction to PHP
• PHP : recursive acronym for "PHP Hypertext Preprocessor“
• Developed in 1995
• Widely-used Open Source scripting language that enables to create
interactive web sites and can be embedded into HTML.
• PHP provides many great features:
• free, easy to learn, fun to use, connects to most databases
• provides many levels of security
• available on most systems: Windows, Linux, Mac OS, etc
• lots of built-in functions

Getting PHP to Work
Three important components need to be installed on the computer system:
 Web server – e.g. Apache (most widely used  free), IIS, PWS
 PHP software distribution (parser)
 Latest stable release is PHP 4.3.7
 PHP version 5 is also available, but this is considered a “release
candidate”.
 Database – e.g. MySQL (most popular RDBMS used over the Internet 
free, fast, flawless), Oracle, Sybase

PHP Basic Syntax
• All PHP code must be included inside one of these special markup tags:
• PHP files must be saved with a php extension, e.g.: .php, .php3 or .php4
• Every statement in PHP must be terminated with a semicolon (;)
• PHP is not generally case-sensitive
• Characters to indicate Comments:
• // or # : single-line comment
• /* here is an introduction to server side script code
inside a multi-line comment */ : multi-line comment
<?php php code goes here ?>
<script language=“php”> php code goes here </script>

Example 1
Save as exe1.php
Output
<html>
<?php
echo “<h1> Hello, World!</h1>”;
?>
</html>

Variables and Data Types
• A variable contains a piece of data.
• e.g.: number of records in a database, person’s name,
• PHP is a “loosely typed” language.
• a single variable may contain any type of data.
• e.g.: a number (integer/floating point),
a string of text or Boolean values.
• not need to declare a variable to be a specific data type
• All variables in PHP begin with a $ (dollar sign).
• Variable names are case sensitive.
$name = “Ahmad”; // assign a string “Ahmad” to $name
$x = 45; // assign an integer 45 to $x

1. introduction to php and variable

1. introduction to php and variable

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