Android PHP Introduction

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PHP is a popular general-purpose scripting language that is especially suited to web development.

Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.

Introduction to PHP?

PHP is a popular general-purpose scripting language that is especially suited to web development.

Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.

PHP Hello World
<?php
echo "Hello world";

PHP's website is here.

Classes

Class definitions start with the keyword class, followed by a class identifier, followed by a pair of curly braces which enclose the definitions of the properties and methods belonging to the class.

A class may contain its own constants, variables (called "properties"), and functions (called "methods").

Here's a simple class definition in PHP:

<?php
class HelloClass
{
    // property declaration
    public $var = 'a default value';

    // method declaration
    public function displayVar() {
        echo $this->var;
    }
}
?>

You can then create an instance:

<?php
$h = new HelloClass();

// This can also be done with a variable:
$className = 'HelloClass';
$h = new $className(); // new HelloClass()
?>

We will be working with PHP in an Object Oriented manner.

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