function_call_benchmark.php

<?php

// Anonymous function (Closure object)
$foo = function () {
    echo '';
};

// procedural function
function foo()
{
    echo '';
}

// Class with static method
class Foostat
{
    public static function foo()
    {
        echo '';
    }
}

$iterations = 1000000;

ob_start();
$t = microtime(true);
$i = 0;
while ($i < $iterations) {
    $foo();
    ++$i;
}
$tmp = microtime(true) - $t;
ob_end_clean();

echo "\$foo() : {$tmp}\n";


ob_start();
$t = microtime(true);
$i = 0;
while ($i < $iterations) {
    foo();
    ++$i;
}
$tmp = microtime(true) - $t;
ob_end_clean();

echo "foo() : {$tmp}\n";


ob_start();
$t = microtime(true);
$i = 0;
while ($i < $iterations) {
    Foostat::foo();
    ++$i;
}
$tmp = microtime(true) - $t;
ob_end_clean();

echo "Foostat::foo() : {$tmp}\n";


ob_start();
$t = microtime(true);
$i = 0;
while ($i < $iterations) {
    call_user_func('foo');
    ++$i;
}
$tmp = microtime(true) - $t;
ob_end_clean();

echo "call_user_func('foo') : {$tmp}\n";


ob_start();
$t = microtime(true);
$i = 0;
while ($i < $iterations) {
    call_user_func('Foostat::foo');
    ++$i;
}
$tmp = microtime(true) - $t;
ob_end_clean();

echo "call_user_func('Foostat::foo') : {$tmp}\n";