iteration_bench.php

<?php

function hashGenerator($items) {
    for ($i = 0; $i < $items; $i++) {
        yield rtrim(base64_encode(md5(microtime())),"=") => rtrim(base64_encode(md5(microtime())),"=");
    }
}

function time_fn($name, callable $fn, ...$args) {
    $start = microtime(true);
    $res = call_user_func_array($fn, $args);
    printf("%s: %.3f\n", $name, microtime(true) - $start);
    return $res;
}

printf("PHP %s\n", phpversion());

$iteration = $argc >= 2 ? $argv[1] : false;
$count = $argc >= 3 ? $argv[2] : 100000;

if ($iteration == "while") {
    $hash = hashGenerator($count);

    time_fn("While iteration", function($hash) {
        while (list($key, $value) = each($hash));
    }, $hash);
} else if ($iteration == "foreach") {
    $hash = hashGenerator($count);

    time_fn("Foreach iteration", function($hash) {
        foreach ($hash as $key => $value);
    }, $hash);
} else {
    print("Usage: {$argv[0]} (while|foreach)\n");
    exit(1);
}