test.php

<?php
function func($param) {
  return $param;
}

class A
{
  public static function staticMethod($param) {
    return $param;
  }
}

class B
{
  public function method($param) {
    return $param;
  }
}

$lambda = function ($param) {
  return $param;
};

$dummy = 123;

$closure = function ($param) use ($dummy) {
  return $param;
};

$n = 10000000;
$start = null;

function start($message) {
  global $start;
  printf("%-50s", $message);
  $start = microtime(true);
}

function stop() {
  global $start, $n;
  $stop = microtime(true);
  printf("%d ms\n", ($stop - $start) * 1000);
}

echo "FUNCTION\n\n";

start("func(...) ");
for ($i = 0; $i < $n; $i++) func(1);
stop();

start("\$func = 'func'; \$func(...)");
$func = 'func';
for ($i = 0; $i < $n; $i++) $func(1);
stop();

start("call_user_func('func', ...)");
$func = 'func';
for ($i = 0; $i < $n; $i++) call_user_func('func', 1);
stop();

echo "\nSTATIC METHOD\n\n";

start("A::staticMethod(...)");
for ($i = 0; $i < $n; $i++) func(1);
stop();

start("\$func = ['A', 'staticMethod']; \$func(...)");
$func = ['A', 'staticMethod'];
for ($i = 0; $i < $n; $i++) $func(1);
stop();

start("\$func = 'A::staticMethod'; \$func(...)");
$func = 'A::staticMethod';
for ($i = 0; $i < $n; $i++) $func(1);
stop();

start("call_user_func(['A', 'staticMethod'], ...)");
for ($i = 0; $i < $n; $i++) call_user_func(['A', 'staticMethod'], 1);
stop();

echo "\nMETHOD\n\n";

$b = new B;

start("\$b->method(...)");
for ($i = 0; $i < $n; $i++) $b->method(1);
stop();

start("\$func = ['\$b', 'method']; \$func(...)");
$func = [$b, 'method'];
for ($i = 0; $i < $n; $i++) $func(1);
stop();

start("\$func = 'method'; \$b->{\$func}(...)");
$func = 'method';
for ($i = 0; $i < $n; $i++) $b->{$func}(1);
stop();

start("call_user_func([\$b, 'method'], ...)");
for ($i = 0; $i < $n; $i++) call_user_func([$b, 'method'], 1);
stop();

echo "\nLAMBDA\n\n";

start("\$lambda(...) ");
for ($i = 0; $i < $n; $i++) $lambda(1);
stop();

start("call_user_func(\$lambda, ...) ");
for ($i = 0; $i < $n; $i++) call_user_func($lambda, 1);
stop();

echo "\nCLOSURE\n\n";

start("\$closure(...) ");
for ($i = 0; $i < $n; $i++) $closure(1);
stop();

start("call_user_func(\$closure, ...) ");
for ($i = 0; $i < $n; $i++) call_user_func($closure, 1);
stop();