<?php
class Timer {
    private $func, $iterations, $start, $stop;
    public function __construct($func = false, $iterations = 500) {
        $args = func_get_args();

        if(is_callable($args[0])) {
            $this->func = $func;
            $this->iterations = is_int($args[1]) ? $iterations : 500;

            $this->execute();
        }

    }
    private function execute() {
        $this->start();
        for($i = 0; $i <= $this->iterations; $i++) {
            $this->func();
        }
        $this->stop();
    }
    public function start() {
        $this->start = microtime(true)
        return $this->start;
    }
    public function stop() {
        $this->stop = microtime(true);
        return $this->stop;
    }
    public function getAverage(){
        return ($this->stop - $this->start) / $iterations;
    }
}
?>