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I’ve been trying to enhance one of my current themes with a dynamic header. The header was supposed to show different images with different links to section of the blog. While searching on the internet for a viable PHP array randomizer function, this is what I ended up with. It works perfectly.

<?php
// Random Image With Link
// Blog Tycoon
// http://www.blogtycoon.net/
//
// Usage:
//
// Save this file as ads.php and use the include function to call it inside your web site

function display_random_img($array) {
	$key = rand(0 , count($array) -1);
	$link_url = $array[$key]['url'];
	$alt_tag = $array[$key]['alt'];
	$random_img_url = $array[$key]['img_url'];
	list($img_width, $img_height) = getimagesize($random_img_url);
	return "<a href=\"$link_url\"><img src=\"$random_img_url\" width=\"$img_width\" height=\"$img_height\" alt=\"$alt_tag\" /></a>";
}

// Edit the following values accordingly
$ads_array = array(
	array(
		'url' => 'http://www.google.com/',
		'alt' => 'Google',
		'img_url' => '/php_random_images_with_links/images/1.png'
	),
	array(
		'url' => 'http://www.yahoo.com/',
		'alt' => 'Yahoo!',
		'img_url' => '/php_random_images_with_links/images/2.png'
	),
	array(
		'url' => 'http://www.msn.com/',
		'alt' => 'MSN',
		'img_url' => '/php_random_images_with_links/images/3.png'
	)
);
$ads_array_1 = array( // add or remove accordingly
	array(
		'url' => 'http://www.google.com/',
		'alt' => 'Google',
		'img_url' => '/php_random_images_with_links/images/1.png'
	),
	array(
		'url' => 'http://www.yahoo.com/',
		'alt' => 'Yahoo!',
		'img_url' => '/php_random_images_with_links/images/2.png'
	),
	array(
		'url' => 'http://www.msn.com/',
		'alt' => 'MSN',
		'img_url' => '/php_random_images_with_links/images/3.png'
	)
);

echo display_random_img($ads_array);
echo display_random_img($ads_array_1); // add or remove accordingly
?>

Download the PHP script with included images here: PHP Random Images (84)

Note: This function does not require GD library.