WordPress Version: 6.3
/**
* Gets the time elapsed so far during this PHP script.
*
* Uses REQUEST_TIME_FLOAT that appeared in PHP 5.4.0.
*
* @since 5.8.0
*
* @return float Seconds since the PHP script started.
*/
function timer_float()
{
return microtime(true) - $_SERVER['REQUEST_TIME_FLOAT'];
}