What are some best practices for passing a varying number of arguments and parameters in PHP functions?

When dealing with a varying number of arguments and parameters in PHP functions, one common approach is to use the func_get_args() function to retrieve all passed arguments as an array. This allows you to handle any number of arguments dynamically within the function. Another option is to use the splat operator (...) in PHP 5.6+ to capture a variable number of arguments into an array.

// Using func_get_args() to handle varying number of arguments
function sum() {
    $args = func_get_args();
    $total = 0;
    foreach ($args as $arg) {
        $total += $arg;
    }
    return $total;
}

echo sum(1, 2, 3, 4); // Output: 10

// Using splat operator (...) to handle varying number of arguments
function multiply(...$numbers) {
    $result = 1;
    foreach ($numbers as $number) {
        $result *= $number;
    }
    return $result;
}

echo multiply(2, 3, 4); // Output: 24