- microtime: documentation ( source)
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "example.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$time_start = microtime(true);
curl_exec($ch);
$time_end = microtime(true);
curl_close($ch);
$exec_time = $time_end - $time_start;
echo 'time: ' . $exec_time . 'secs';
?>