Microtime()¶
microtime() is a native PHP function, which returns the current timestamp, with the microseconds. This is a very precise measure of time.
microtime() is often used for speed measures, and it may be easily replaced by hrtime() for such purpose, since PHP 7.3.
<?php
$time_start = microtime(true);
// Sleep some time
usleep(100);
$time_end = microtime(true);
$time = $time_end - $time_start;
echo Slept for $time seconds\n;
?>