PHP Script that benchmarks verious timing safe functions. https://github.com/yohgaki/php-src/compare/PHP-5.6-rfc-hash-compare

bench.php

<?php
$iterations = 1000000;
$data_size  = 1024;
$funcs = ['str_siphash_compare', 'str_xxhash32_compare', 'str_md5_compare', 'str_byte_compare', 'str_byte_compare2', 'str_word_compare', 'str_compare' ];

foreach($funcs as $f) {
    benchmark($f, $iterations, $data_size);
}

function benchmark($f, $i, $dsz) {
    $d1 = file_get_contents("/dev/urandom", 0,NULL,-1,$dsz);
    $d2 = file_get_contents("/dev/urandom", 0,NULL,-1,$dsz);
    $n  = 0;
    $start = microtime(TRUE);
    while($n < $i) {
        if ($f($d1,$d2)) {
            echo 'Error: '.$f.' '.$n.$d1.$d2.PHP_EOL; 
            die('Exiting'.PHP_EOL);
        }
        $n++;
    }
    printf('%-20s Elapsed: %f   Iterations: %d DataSize: %d'.PHP_EOL, $f, microtime(TRUE)-$start, $i, $dsz);
}