Arrays

Define an array

Array ( [0] => onion [1] => tomato [2] => cheese [3] => anchovies [4] => ham [5] => pepperoni )

Define an associative array or "hash table"

Array ( [red] => apple [yellow] => banana [purple] => plum [green] => grape )

Explode function will turn a normal variable in to an array using a delimiter to seperate each element

Array ( [0] => red [1] => blue [2] => green [3] => yellow )

Push and pop can add and remove the last element in an array

Array ( [0] => spaghetti [1] => penne [2] => tagliatelle ) Array ( [0] => vermechelly [1] => penne [2] => tagliatelle )

Source code:

<? require_once("site.php");?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>
<head>
        <title> Arrays </title>
        <link rel="stylesheet" type="text/css" href="test.css" />
</head>
<body><div id="page">
	<div id="headder">
		<h1> Arrays </h1>
	</div>

<div id="main-area">
	<h2>Define an array</h2>

<?php
		// define an array
		$pizzaToppings = array('onion', 'tomato', 'cheese', 'anchovies', 'ham', 'pepperoni');
		print_r($pizzaToppings);

<h2>Define an associative array or "hash table"</h2>

<?php

// define an associative array
		$fruits = array('red' => 'apple', 'yellow' => 'banana', 'purple' => 'plum', 'green' => 'grape');
		print_r($fruits);
	?>

<h2>Explode function will turn a normal variable in to an array using a delimiter 
	to seperate each element</h2>

<?php
		// Explode function

// define CSV string
		$str = 'red, blue, green, yellow';

// split into individual words
		$colors = explode(', ', $str);

/*The explode function has created an array with $str. The ', ' is the delimiter
		so to translate it reads $str until it reaches a ", "and makes that the first
		entry in the $colors array. It then continues to read $str until it reaches the
		next delimiter and that becomes $colors[2], and so on. */

print_r($colors);

//Print_r() is mainly for debugging, it will display an array for you.

<h2>Push and pop can add and remove the last element in an array</h2>

<?php
		//Push and pop

// define an array
		$pasta = array('spaghetti', 'penne', 'macaroni');

// add an element to the end
		array_pop($pasta);
		array_push($pasta, 'tagliatelle');
		print_r($pasta);
	?>

<?php
		//Shift and unshift
		array_shift($pasta);
		array_unshift($pasta, 'vermechelly');
		print_r($pasta);
	?>

</div>
        <div class="clearfloat">
        </div>
</div></body>
</html>