<?php

class A {

    private $x;
    private $y;

    public function set_x($x) {
        $this->x = $x;
    }

    public function set_y($y) {
        $this->y = $y;
    }

}


$start_time = microtime(TRUE);

for ($i = 0; $i < 5000000; ++$i) {

    $a = new A();
    $a->set_x('x');
    $a->set_y('y');

    unset($a);

}

$end_time = microtime(TRUE);

echo $end_time - $start_time . PHP_EOL;