php function coded default parameter num

Question

In PHP, is it possible to get the coded parameter count?

Something like this(pseudo code):

function($a=false , $b=true){ //the $a=true... is just parameters, with default values
  echo func_num_args();
  echo ", ";
  echo func_get_coded_params(); //how do i do this in PHP?
}

echo function(1 , 2); // output -> 2, 2 

echo function(1, 2, 3, 4, 5, a, b, c); // output -> 8, 2

Is there an way/imaginary function(func_get_coded_params()) that can retrieve the default coded parameter count? In this case, the coded parameters would be $a and $b itself which returns 2. If i do function($a, $b, $c) it would return 3

Why would you want to do this? It's constant in every function. — Pieter Bos
– Pieter Bos, Commented Aug 17, 2012 at 15:53
You shouldn't have $a and $b there if you using func_num_args() or func_get_args() — Waygood
– Waygood, Commented Aug 17, 2012 at 15:53
i still need my default parameters in my function, so that's why i need $a and $b and vars like that — tom91136
– tom91136, Commented Aug 17, 2012 at 15:55
I'm still not quite sure why you would need such a function, as it is a constant in a function. — Pieter Bos
– Pieter Bos, Commented Aug 17, 2012 at 15:59

Community · Accepted Answer · 2023-11-17 20:29:45Z

4

Use ReflectionFunction and call the getNumberOfParameters method.

You can create an instance of the current function using:

$func = new ReflectionFunction(__FUNCTION__);

And get the number of defined parameters using

$func->getNumberOfRequiredParameters();

Edit

For use in classes.

$func = new ReflectionMethod(__CLASS__, __FUNCTION__);

edited Nov 17, 2023 at 20:29

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answered Aug 17, 2012 at 15:59

lll

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2 Comments

tom91136 Over a year ago

wait, what if i want to do this in __construct()? i tried to put this in construct and an exception is raised saying __construct() is not found...

lll Over a year ago

For inside a class you will need to use ReflectionMethod instead. new ReflectionMethod(__CLASS__, __FUNCTION__);

ttzn · Accepted Answer · 2012-08-17 15:59:37Z

2

PHP has a number of useful Reflection classes you can use.

function whatever($a, $b, $c)
{
  $reflection = new ReflectionFunction(__FUNCTION__);
  echo func_num_args() . ', ' .  $reflection->getNumberOfRequiredParameters();
}

whatever(1,2,3,4,5); // Prints 5, 3

Check http://www.php.net/manual/fr/class.reflectionfunction.php

answered Aug 17, 2012 at 15:59

ttzn

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Comments

raidenace · Accepted Answer · 2012-08-17 16:32:41Z

0

This will do what you need:

class x
{
    function __construct($a=1,$b=2)
    {

        $constructor = new ReflectionMethod(__CLASS__,__FUNCTION__);
        $params = $func->getNumberOfParameters();
        echo func_num_args().",".$params;
    }
}
$x = new x(1,2,3,4); //output -> 4,2

Note that since you are having default values defined for your arguments in the constructor, what you need to call is getNumberOfParameters() and not getNumberOfRequiredParameters() (because there are no required parameters, they all have default values)

edited Aug 17, 2012 at 16:32

answered Aug 17, 2012 at 16:13

raidenace

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