sockets - Checking UDP port in PHP -

sockets - Checking UDP port in PHP -

i'm trying check servers udp port using php. here code:

<?php set_error_handler('my_error_handler'); function my_error_handler($errno, $errstr, $errfile, $errline) {} function checkudp($host,$port=80){ $fp = fsockopen("udp://".$host, $port, $errno, $errstr,1.0); if (!$fp) { homecoming false; } else { fclose($fp); homecoming true; } } if(checkudp($myip,9)){ echo $myip.' open'; }else{ echo $myip.' closed'; } echo '<br />'; ?>

but true result (port open). code works on tcp port why couldn't udp port results?

php sockets udp