Direct call vs call_user_func() vs call_user_func_array()

call_user_func_benchmark.php

<?php

class Benchmark
{
    private $start = null;

    public function __construct()
    {
        $this->start = microtime(true);
    }

    public function stop()
    {
        return microtime(true) - $this->start;
    }
}

$benchmarkFunction = function() {
    return array_sum(func_get_args());
};

$repeat = function($times, Closure $c) {
    for ($i = 0; $i < $times; $i++) {
        $c();
    }
};

$b = new Benchmark();

$repeat(1000000, function() use ($benchmarkFunction) {
    $benchmarkFunction(1, 2, 3, 4, 5);
});

echo "direct: " . $b->stop() . PHP_EOL;

$b = new Benchmark();

$repeat(1000000, function() use ($benchmarkFunction) {
    call_user_func($benchmarkFunction, 1, 2, 3, 4, 5);
});

echo "call_user_func: " . $b->stop() . PHP_EOL;

$b = new Benchmark();

$repeat(1000000, function() use ($benchmarkFunction) {
    call_user_func_array($benchmarkFunction, [1, 2, 3, 4, 5]);
});

echo "call_user_func_array: " . $b->stop() . PHP_EOL;