Benchmark: foreach vs. array_map

foreach-vs-array_map.php

<?php

function benchmark($label, $callback) {
	$start = microtime(true);

	$callback();

	$time = microtime(true) - $start;
	echo "Run $label took " . number_format(1000 * $time, 3) . " ms\n";
}

class User {
	public $email;

	public function __construct() { $this->email = 'user' . rand(0, 10000) . '@email.com'; }
}

function getUserEmail($user) { return $user->email; }

$users = array();
for ($i = 0; $i < 8000; $i++) {
	$users[] = new User;
}

benchmark('foreach', function () use ($users) {
	$emails = array();
	foreach ($users as $user) {
		$emails[] = getUserEmail($user);
//		$emails[] = $user->email;
	}
});

benchmark('array_map', function () use ($users) {
	$emails = array_map('getUserEmail', $users);
//	$emails = array_map(function ($user) { return $user->email; }, $users);
});