/dev/null && /usr/sbin/arp | grep $ip | grep -oh [0-9a-f][0-9a-f][:-][0-9a-f][0-9a-f][:-][0-9a-f][0-9a-f][:-][0-9a-f][0-9a-f][:-][0-9a-f][0-9a-f][:-][0-9a-f][0-9a-f]"); $maccheck=shell_exec("cat /var/www/IPs | grep $mac"); echo $ip; echo $mac; ob_end_clean(); if ( $maccheck == '' ) { echo("you may pass! please click the button below"); echo("

"); echo $mac; $file=fopen("/var/www/IPs", "a"); $output=fwrite($file, $mac); } else { echo("YOU MAY NOT PASS!"); } ?>