need help to stop spammers

[darklexus2k9]

hi i have a download site and well it gets a lot of spam url posts like the one bellow

 

http://www.ghdsbfhsbhjbfwsbehf.com

 

is there any way the cheek the url entered in a forum before it is submitted to make sure it is live and has the right headers and stuff

 

or have like 2 buttons one is active and one is not the first button is a test button so you click the test button and it cheeks the url in a text feild and if it is live and has the right headers and stuff the second button is activetd and the first one is deactivated

 

any help with this wood realy help a lot thanks

 

pleas no flaming english is my second language so i not so good

[JonnoTheDev]

You can check the http status code from the url i.e a 200 or a 302 is valid.

<?php
function httpHeader($server) {
$fp = @fsockopen($server,80,$errno,$errstr,30);
$out  = "GET / HTTP/1.1\r\n"; 
$out .= "Host: $server\r\n"; 
$out .= "Connection: Close\r\n\r\n";
@fwrite($fp,$out);
$content = @fgets($fp);
if(strstr($content, "200") || strstr($content, "302")) {
	return true;
}
return false;
}

// usage
if(httpHeader("www.bing.com")) {
print "url ok";
}
else {
print "bad url";
}
?>