Question

I’ve been wondering how I could check all my parameters efficiently in any function in a clean and concise way.
I’ve come up with :

function fooBar($myArg, $mySecondArg, $myOptionnalArg = "defaultValue"){
    if(!isset($myArg, $mySecondArg, $myOptionnalArg){
        die(__FUNCTION__ . ":missing parameter");
    }

    if(empty($myArg, $mySecondArg, $myOptionnalArg){
        die(__FUNCTION__ . ":empty parameter");
    }
    //Do stuff
}

What I’m looking for is more like:

function fooBar($myArg, $mySecondArg, $myOptionnalArg = "defaultValue"){
    $argArray = func_get_args();
    foreach($argArray as $a){
        if(empty($a)){
            die(__FUNCTION__.":".get_arg_name($a)."is empty");
        }        
        if(!isset($a)){
            die(__FUNCTION__.":".get_arg_name($a)."is unset");
        }    
    }
    //Do stuff
}

Wich doesn’t work since get_arg_name(); is pure fiction, and func_get_args(); returns the actual parameters, rather than the ones defined in the prototype.

Could someone give me a hint about it? Any other good/clean way to achieve that is also welcome.
Thanks

Answer 1

With reflection only. Some example:

function test($a, $b, $c) {
  $function = new ReflectionFunction(__FUNCTION__);
  $parameters = $function->getParameters();

  print_r($parameters);
}

test(0, 1, 2);

You will see something like this:

Array
(
    [0] => ReflectionParameter Object
        (
            [name] => a
        )

    [1] => ReflectionParameter Object
        (
            [name] => b
        )

    [2] => ReflectionParameter Object
        (
            [name] => c
        )

)