PHP perfomance test

<?php
/**
 * Исходный код для статьи http://anton-pribora.ru/articles/php/php-rerfomance/
 */

$start   = microtime(true);
$cycles  = 0;
$elapsed = 0;
$result  = '';

do {
    $loops = 1000;
    $begin = microtime(true);
    do {
        // Тестируемая операция
        $result .= new A(array('foo' => 'bar'));
    } while (--$loops);
    $cycles  += 1000;
    $elapsed += microtime(true) - $begin;
} while (microtime(true) - $start < 1);

printf("%s: %.0f cycle/sec, %s bytes, %s bytes/cycle\n", PHP_VERSION, $cycles / $elapsed, strlen($result), strlen($result) / $cycles);

class A
{
    private $foo;
    private $bar;
    private $baz;
    private $bee;

    public function __construct($array)
    {
        foreach($this as $prop => $value) {
            if ( isset($array[$prop]) ) {
                $this->{$prop} = $array[$prop];
            }
        }
    }

    public function __toString()
    {
        $result = array();

        foreach($this as $prop => $value) {
            $result[] = $prop .': '. $this->{$prop};
        }

        return join("\n", $result);
    }
}