<?php

define('ITERATIONS', 9999);

$t = microtime(true);

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

    $inner1 = create_function(
        '',
        'return null;'
    );
}

print 'create_function: ' . (microtime(true) - $t). PHP_EOL;

$t = microtime(true);

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


    $inner2 = function()
    {
        return null;
    };
}

print 'closure: ' . (microtime(true) - $t). PHP_EOL;