php get function argument length

Question

I am wondering if you can get the argument length of a php functions arguments from an external scope.

$test = function($one, $two) {
  // this will work inside the scope of the function
  $length = func_num_args();
};
// I would like to access it from outside the functions scope
$length = get_arg_count(test); // => 2

If I var_dump(test) I can see a property on the Closure of properties but I can't get at it.

There is func_num_args(void) but that only works from inside the function scope.

I have tried...

test->properties;
test->properties();
test::properties;
test::properties();
test['properties'];

deceze · Accepted Answer · 2016-12-15 09:44:18Z

3

You'll want to reflect on the function:

$ref = new ReflectionFunction($test);
echo $ref->getNumberOfParameters();

answered Dec 15, 2016 at 9:44

deceze♦

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YaHui Jiang · Accepted Answer · 2016-12-15 09:59:17Z

1

code:

$test = function($one, $two) {
    // this will work inside the scope of the function
    $length = func_num_args();

    var_dump($length); // => 2
};

var_dump($test);

result:

Press ENTER or type command to continue
object(Closure)#1 (1) {
  ["parameter"]=>
  array(2) {
    ["$one"]=>
    string(10) "<required>"
    ["$two"]=>
    string(10) "<required>"
  }
}

if return function argument length, You can try ReflectionFunction

edited Dec 15, 2016 at 9:59

answered Dec 15, 2016 at 9:51

YaHui Jiang

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