Back Linl Checker

[Bartman]

Can someone please point me in the right direction on finding a script that will check for a back link before allowing the submission of a form? Maybe it is onclick or something to that nature. Thanks, I have been searching for days

[JonnoTheDev]

<?php
function check_backlink($url, $tofind) {
                // prevent using the same url to return true
	if(stristr($tofind, $url)) {
		return false;
	}	
	ob_start();
	if(!@readfile($url)) {
		return false;
	}
	$body = ob_get_contents();
	ob_end_clean();
	if(stristr(htmlentities($body),$tofind)) {
		return true;
	}
	return false;
}

// usage
$to_check = 'http://www.thirdpartywebsite.com';
$looking_for = 'http://www.mywebsite.com';
if(!check_backlink($to_check, $looking_for)) {
echo "no backlink found";
}
else {
echo "thanks";
}
?>