CODEWITHSUNDEEP
phpoptional-parameters
Chris Middleton
Chris Middleton

Reputation: 5924

Get number of formal parameters in PHP

I know you can use func_num_args to get the number of actual arguments passed in. Is there any way to get the number of formal parameters?

Example:

<?php

function optional($a, $b = null) {
    echo func_num_args();
}

optional(1); // 1
optional(1, 1); // 2
optional(1, 1, 1); // 3

I want a way to get 2 in each of those calls to optional, without hard-coding it.

Upvotes: 1

Views: 89

Answers (1)

georg
georg

Reputation: 214949

One way is with ReflectionFunction, e.g.:

function optional($a, $b = null) {
    return (new ReflectionFunction(__FUNCTION__))->getNumberOfParameters();
}

Upvotes: 3

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