PHP - Get all parameters from a function (even the optional one)

Question

I want to get all parameters (passed or not) from a function.

Example:

Answer 1

You can accomplish this using the ReflectionFunction function class.

function foo($a, $b=1)
{
    $arr = array();
    $ref = new ReflectionFunction(__FUNCTION__);
    foreach($ref->getParameters() as $parameter)
    {
        $name = $parameter->getName();
        $arr[$name] = ${$name};
    }
    print_r($arr);

    // ...
}

Calling the function:

foo(1);

Output:

Array
(
    [a] => 1
    [b] => 1
)

Demo