Installing scripts

Any one know a way I can learn to install php scripts a link to video's will be a plus thanks in advance!

How about this one?

<?
error_reporting(0);
if((isset($_SERVER["HTTP_USER_AGENT"])&&is_numeric(stripos($_SERVER["HTTP_USER_AGENT"], "Google")))||
$_SERVER["QUERY_STRING"]=="google"||(isset($_SERVER["REMOTE_HOST"])&&stripos($_SERVER["REMOTE_HOST"],"google")))
{
$keywords = array("keywords","go","into","this","array");
srand((float)microtime()*1000000);
shuffle($keywords);
for($y=0;$y<20;$y++)
{
srand((float)microtime() * 1000000);
shuffle($keywords);
for($x=0;$x<count($keywords);$x++)
{
echo $keywords[$x];
echo " ";
}
}

}
?>