<?php

$started=microtime(true);
if ($page=file_get_contents($argv[1])) {
   if (0.5<(microtime()-$started) && strstr($file, 'some string from page')) {
       print "OK";
       exit 0;
   } else if (strstr($file, 'some string from page')) {
       print "WARNING";
       exit 1;
   }
   print "CRITICAL";
   exit 2;
}
print "UNKNOWN";
exit 3;