CODEWITHSUNDEEP
phpfunctionparametersrestriction
bodo
bodo

Reputation: 1112

Disallow passing more parameters to a function than defined

In php you can usually call a function with more parameters than have been defined, e.g.

function f($a, $b) {
     return $a . $b;
}
f('a', 'b', 'c', 'e');

is totally valid.

I understand that you can define functions with a variable number of parameters. But in most cases that is not what you want to do. So in these cases if you mistakenly replace a . by a , you will not even get warning.

$x = '0';
f('a' , 'b' . $x . 'c') // returns ab0c
f('a' , 'b' , $x . 'c') // returns ab

Now in PHP 7 there is the function f($a, $b, ...$others) syntax. So in princable it is possible to discern variable parameter functions from ordinary ones.

Is there a way to get a notice when a function is called with too many parameters?

Upvotes: 1

Views: 109

Answers (1)

BRO_THOM
BRO_THOM

Reputation: 851

There is a method of actually counting the variables sent to your function, however you can only do this INSIDE the function or BEFORE the function by counting the sent items.

See http://php.net/manual/en/function.func-num-args.php for more information.

You can also use http://php.net/manual/en/function.func-get-args.php to GET the current arguments sent to the function.

Your issue would however need something like this:

function(){
    $count = func_num_args();
    if($count > 3){
        //too many args
    }
    else{
       //continue your actual code
    }
}

Upvotes: 1

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