PHP: The easiest language to learn.

PHP

The easiest language to learn.

By Binny V A

http://www.bin-co.com/php/

PHP P HP: H ypertext P reprocessor PHP: Hypertext Preprocessor PHP: Hypertext Preprocessor PHP: Hypertext Preprocessor PHP: ... Like GNU.

Its Easy – but Hard

To use PHP, you must know...

HTML

SQL

CSS

JavaScript

Web Server(Apache) Configuration

Database Server(MySQL) Configuration

LAMP Linux/Apache/MySQL/PHP

Hello World!

<?php

print “Hello World”;

?>

php file.php

firefox http://localhost/file.php

Variables $ Prefix for variables $name = 'ILUG' ; // String $year = 2008 ; // Number $is_php_good = true ; // Boolean // is a comment – as is /* to */ - PHP follows the C Syntax

Arrays/Hashes $arr = array(“Indian”, “Linux”, “User”, “Group”); $arr[1] = 'Libre'; print $arr[1]; $details = array( “abbr” => “ILUG”, “full” => “Indian Libre User Group” ); print $details['full'];

Operators

+ 5+2 Plus

- 5-2 Minus

*

/

== 1 == true

=== 1 !== true

!=

% Mod

= $a = 5

. “hel” . “lo”

etc.

Control Flow: if If if($name == 'Binny') { print “Hi, Binny”; } elseif($name == 'Sameer') { print “Hello Sameer”; } else { print “Hello everybody”; }

For/Foreach For $languages = array('PHP', 'Ruby', 'JavaScript', 'Python', 'Perl', 'Tcl'); for($i =0; $i < count($languages); $i++) { print $i+1 . “) “ . $languages[$i]; } Foreach foreach($languages as $lang) { print $lang; }

While Loop $i = 1; While($i < 10) { print $i; $i++; }

Functions function hello($name) { print “Hello, $name.”; } hello(“World”);

OOPs and PHP

PHP 5 has all the most necessary OOPs features...

Constructors/Destructors

Visibility (public, private, protected)

Static Methods/Variables

Abstraction

Inheritance

And more...

Class class Movie { public $name; function __construct($movie_name) { $this->name = $movie_name; } function show() { print $this->name; } } $film = new Movie(“City of God”); $film->show();

Getting Help PHP Manual(CHM) Install KCHM to view it.

Functions

String Functions

strtolower() / strtoupper()

str_replace()

strpos()

Array Functions

array()

count()

array_push()

array_splice()

...

Database

MySQL must be installed and running.

Need Information about...

server(usually 'localhost')

username

password

database

Connection mysql_connect('localhost', 'root', 'password'); mysql_select_db('database_name'); Use a database abstraction layer. $db = new Sql(“localhost”, 'root', 'password', 'database_name');

Executing Queries $sql_handle = mysql_query(“SELECT id,name FROM users WHERE status='1'”) or die(mysql_error()); $result = mysql_fetch_assoc($sql_handle); print $result['name'];

Fetching Result while($result = mysql_fetch_assoc($sql_handle)) { print $result['name']; } Use Database Abstraction layer!

PHP and the Web Embedding PHP... <strong><?php print hello($name) ?></strong>

Form Submission <form action=”action.php” method=”post”> Age: <input type=”text” name=”age” /> <input type=”submit” name=”action” value=”Save” /> </form>

action.php if($_POST['action'] == 'Save') { print $_POST['age']; }

Frameworks

Zend

CodeIgnite

CakePHP

Symphony

And more..

Free Software

CMS Tools

WordPress

Drupal

Joomla/Mambo

Forum

phpBB

BbPress

Shopping Cart

Wiki

Credits Getting Help: http://www.flickr.com/photos/doctorow/2496308570/ MySql: http://www.flickr.com/photos/johnniewalker/359440369/ Framework Image : http://www.sxc.hu/photo/916787 Free Software: http://www.flickr.com/photos/marcomolinari_it/2474783234/