performance measurement of closure and class construction.

closure_faster_than_new_class.php

<?php
// Here your code !

function runIt($closure, $title)
{
    $n = 1000000;
    $time1 = microtime(true);
    $closure($n);
    $time2 =  microtime(true);

    echo sprintf("%12s: %6.2f  msec\n", $title, ($time2 - $time1) * 1000);
};

$do_closure = function ($n = 100)
{
    for($i = 0; $i < $n; $i++) {
        $s = function() use($i) {return 'hi';};
    }
};

class sample {
    function __invoke() {
        return 'hi';
    }
}

$do_class = function ($n = 100)
{
    for($i = 0; $i < $n; $i++) {
        $s = new sample($i);
    }
};

$do_clone = function ($n = 100)
{
    $s0 = new sample();
    for($i = 0; $i < $n; $i++) {
        $s = clone $s0;
    }
};

function test_func($i) {
    return 'hi';
}
$do_function = function ($n = 100)
{
    for($i = 0; $i < $n; $i++) {
        $s = test_func($i);
    }
};

runIt($do_function, 'function');runIt($do_closure, 'closure');
runIt($do_class, 'new class');
runIt($do_clone, 'clone obj');

result (on Mac mini, Core i7, PHP5.6.16)

    function: 1175.23  msec
     closure: 482.19  msec
   new class: 428.53  msec
   clone obj: 354.40  msec