Question

Is it possible to count missing arguments in a PHP function? I want to do this:

// I have this
function foo($param1, $param2, $param3) {
    // I need some sort of argument counter
}

foo("hello", "world");

When I use the foo function like above, I want a way to find out that not all arguments are used.

Either by counting all arguments and comparing to get_defined_vars(), or by using a function that gives me the count of missing arguments.

Edit:
I need the method to stop running if some of the arguments are missing when error_reporting is turned of.

if(!foo($param)) { echo "Couldn't Foo!"; }

Answer 1

If you want to do this super-dynamical, use reflection to get the expected parameter count and compare that number to what func_num_args() returns:

function foo($p1 = null, $p2 = null, $p3 = null) {
    $refl = new ReflectionFunction(__FUNCTION__);

    $actualNumArgs = func_num_args();
    $expectedNumArgs = $refl->getNumberOfParameters();

    $numMissingArgs = $expectedNumArgs - $actualNumArgs;

    // ...