benchmark.php

<?php

function benchmark(array $callables, int $repeat = 100000): array
{

    $ret = [];
    $save = $repeat;

    foreach ($callables as $key => $callable) {

        $start = hrtime(true);

        do {      
            $callable();
        } while($repeat -= 1);

        $stop = hrtime(true);
        $ret[$key] = $stop - $start;
        $repeat = $save;
    }

    return $ret;
}