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<?php
$time_start = microtime(true);

for ($i = 0; $i < 1000; ++$i) {

   if (preg_match("/[0-9]+/", $i)) {
      echo null;
   }
}

$time_end = microtime(true);
$time = $time_end - $time_start;
echo "{$time} seconds\n";