Need a simple PHP code to select random element of an array

I am looking to rotate ads (not adsense code but some other javascript ads). There are 4 types of ads, so I am thinking of putting it in an array and than use random function to select one of them to display.

Something like
<?php
arr[4];
arr[0]="Code1";
...
arr[3]="Code4";

num=Rand(give a number from 0 to 3);
echo $arr[num];
?>

Any help ?

 

<?php

$ads_array = array(
	'Code1',
	'Code2',
	'Code3',
	'Code4'
);

	$ad = $ads_array[array_rand($ads_array)];

	echo "Your ad is: $ad.\n";
?>

PHP:

 

thanks seo_otter , will test the code later and inform how it worked.

I am sure the elemensts, ode1,code2 can be multiple lines...

 

Not sure what you mean exactly, or if you're asking if they can be multiple lines, but the answer is yes. Or more specifically, it doesn't matter

I only used a different notation than you, but it does the exact same thing. You can still populate and print the array using your notation and naming instead of mine if you prefer:

$arr = array();

$arr[0]="Code1";
$arr[1]="Code2";
$arr[2]="Code3";
$arr[3]="Code4";

echo $arr[array_rand($arr)];

PHP:

That looks a little more like your original code