PHPで関数に引数として配列を渡すにはどうすればよいですか?

function variadic(...$args) {
    echo implode(' ', $args);
}

$array = ['Hello', 'World'];

// Splatting the $array
variadic(...$array); // Output: 'Hello World'

function variadic($arg1, $arg2) {
    echo $arg1 . ' ' . $arg2;
}

$array = ['Hello', 'World'];

// Using call_user_func_array()
call_user_func_array('variadic', $array); // Output: 'Hello World'

function variadic(string $arg2, string $arg1) {
    echo $arg1 . ' ' . $arg2;
}

$array = ['arg2' => 'Hello', 'arg1' => 'World'];

variadic(...$array); // Output: 'World Hello'