<?php
$videos = array();
$videos[0] = "http://www.youtube.com/embed/XXXXXXXXXX"; 
$videos[1] = "http://www.youtube.com/embed/XXXXXXXXXX"; 
$videos[2] = "http://www.youtube.com/embed/XXXXXXXXXX"; 
$videos[3] = "http://www.youtube.com/embed/XXXXXXXXXX";
 
$height = "315";
$width = "420";
$frameborder = "0";
// Should not need to edit below this line.
$videosTotal = count($videos); 
$random = range(0, $videosTotal-1); 
shuffle($random); 
echo "<iframe width='" . $width . "' height='" . $height . "' src='" . $videos[$random[0]] . "' frameborder='" . $frameborder . "' allowfullscreen></iframe>";
?>