Blue Hat SEO-Advanced SEO Tactics

<?
$sites[’stumbleupon’] = ‘Glad you stumbled upon us. Please leave us a nice review if you enjoy the site!’;
$sites[’digg.com’] = ‘Glad you found us on Digg. Please Digg up if you like!’;

if( !empty( $_SERVER[’HTTP_REFERER’] ) ) {
    $data = parse_url( $_SERVER[’HTTP_REFERER’ ] );
    foreach( $sites as $domain => $text ) {
        if( strpos( strtolower( $data[’host’] ), $domain ) !== false ) {
            echo ‘<script type=”text/javascript”>alert(”‘.addslashes($text).’”);</script>’;
            break;
        }
    }
}
?>

$sites{’stumbleupon’} = ‘Glad you stumbled upon us. Please leave us a nice review if you enjoy the site!’;
$sites{’digg.com’} = ‘Glad you found us on Digg. Please Digg up if you like!’;

if ($ENV{’HTTP_REFERER’} ne “”){
	foreach $key (keys %sites) {
		if($ENV{’HTTP_REFERER’} =~ /$sites{’$key’}/) {
			print qq~<script type=”text/javascript”>alert(”$line”);</script>~;
		}
	}
}

<script language=”javascript” type=”text/javascript”>
if (document.referrer.indexOf(”stumbleupon”) > 0)
{
alert(’Glad you stumbled upon us. Please leave us a nice review if you enjoy the site!’);
}else if (document.referrer.indexOf(”digg”) > 0)
{
alert(’Glad you found us on Digg. Please Digg up if you like!’);
}
</script>