random_int vs mt_rand

benchmark.php

<?php
function timer(callable $block) {
    $start = microtime(true);
    for ($i = 0; $i < 100000; ++$i) {
        $block();
    }
    $end = microtime(true);
    return $end - $start;
}

$tests = [
    'random_int' => timer(function() {
        random_int(0, 255);
    }),
    'mt_rand' => timer(function() {
        mt_rand(0, 255);
    })
];

asort($tests);

var_dump($tests);

result.txt

array(2) {
  ["mt_rand"]=>
  float(0.017313003540039)
  ["random_int"]=>
  float(0.028265953063965)
}

Exactly what I was looking for. Thanks!