PHP: что быстрее — массивы или объекты?

<?php

$test_iteration = 50000000;

function get_rand_data() {
	return [
		'a' => mt_rand(1, 1000),
		'b' => mt_rand(1, 1000),
		'c' => mt_rand(1, 1000),
		'd' => mt_rand(1, 1000),
		'e' => mt_rand(1, 1000),
	];
}

function prepare_data(&$data) {
	return ($data['a'] * $data['b'] / ( $data['c'] * $data['d'] )) / $data['e'];
}

class Data {
	protected $data = [];
	public function __construct(array &$data = []) {
		$this->data = $data;
	}
	public function run() {
		return ($this->data['a'] * $this->data['b'] / ( $this->data['c'] * $this->data['d'] )) / $this->data['e'];	
	}
	public function setData(array &$data) {
		$this->data = $data;
		return $this;
	}
	public function setDataNotReturn(array &$data) {
		$this->data = $data;
	}
}

class StaticData {
	public static function run(&$data) {
		return ($data['a'] * $data['b'] / ( $data['c'] * $data['d'] )) / $data['e'];	
	}
}

function show_delta($end, $start, $text) {
	return $text.': '.round(($end-$start), 5). " seconds\n";
}

$start = microtime(1);
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	prepare_data($data);
}

echo show_delta(microtime(1), $start, 'Array mode');

$start = microtime(1);
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	$result = ($data['a'] * $data['b'] / ( $data['c'] * $data['d'] )) / $data['e'];
}

echo show_delta(microtime(1), $start, 'Array run body for mode');

$start = microtime(1);
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	(new Data($data))->run();
}

echo show_delta(microtime(1), $start, 'Object mode');

$start = microtime(1);
$runner = new Data();
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	$runner->setData($data)->run();
}

echo show_delta(microtime(1), $start, 'Object mode (v2)');

$start = microtime(1);
$runner = new Data();
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	$runner->setDataNotReturn($data);
	$runner->run();
}

echo show_delta(microtime(1), $start, 'Object mode (v3)');

$start = microtime(1);
for($i =0; $i<$test_iteration; ++$i) {
	$data = get_rand_data();
	StaticData::run($data);
}

$delta = microtime(1) - $start;

echo show_delta(microtime(1), $start, 'Static object mode');