Benchmark of different function calls in PHP

benchmark.php

<?php

// Commons
$callable = function() {};
function empty_function() {};

class A {
    public static function empty_function() {}
    public function        empty_method  () {}
}

$instance = new A;


// Tests
$tests['control'] = $callable;

$tests['cufa_fga'] = function() use ($callable) {
    call_user_func_array($callable, func_get_args());
};

$tests['cufa_array'] = function() use ($callable) {
    call_user_func_array($callable, array());
};

$tests['cuf'] = function() use ($callable) {
    call_user_func($callable);
};

$tests['variable'] = function() use ($callable) {
    $callable();
};

$tests['static'] = function() use ($callable) {
    A::empty_function();
};

$tests['method'] = function() use ($instance) { // Here we use $instance instead of $callable
    $instance->empty_method();
};

$tests['direct'] = function() use ($callable) {
    empty_function();
};

// Run tests
$n = 500000;

$results = array();
foreach ($tests as $name => $func) {
    $start = microtime(true);
    for ($i=0; $i < $n; $i++) { 
        $func();
    }
    $results[$name] = microtime(true) - $start;
}

// Output results, padded because it's beautiful
$control = $results['control'];

$lname = max(array_map('strlen', array_keys($results)));
$ltime = ceil(log(max($results) * 1000, 10));

unset($results['control']);
asort($results);

printf("%{$lname}s:  %{$ltime}dms\n", 'control', $control * 1000);

foreach ($results as $name => $time) {
    printf(
        "%{$lname}s:  %{$ltime}dms    (+ %{$ltime}dms)\n",
        $name,
        $time * 1000,
        ($time - $control) * 1000
        );
}

results.txt

PHP 5.4.5 with Xdebug 2.2.1 and APC 3.1.10

   control:  1786ms
    direct:  2682ms    (+  895ms)
    static:  2726ms    (+  939ms)
    method:  2766ms    (+  979ms)
  variable:  3883ms    (+ 2096ms)
       cuf:  4862ms    (+ 3075ms)
cufa_array:  5119ms    (+ 3332ms)
  cufa_fga:  5762ms    (+ 3975ms)

Roule tes tests n times, prend la moyenne et la stddev et fait des intervalles de confiance :)