chrono add method

tried:
<?php include('surikat/control.php');control::dev();

//view::index();
use control\chrono;

$str = 'helloworlddevId';
$find = 'Id';

chrono::start('strrpos');
for($i=0;$i<=100000;$i++)
	$v = strrpos($str,$find)==strlen($str)-strlen($find);
chrono::showAll('strrpos');

chrono::start('substr');
for($i=0;$i<=100000;$i++)
	$v = substr($str,-1*strlen($find))==$find;
chrono::showAll('substr');

//conclusion: substr is faster