Get PHP callable arguments as an array?

Question

Say I have a callable stored as a variable:

$callable = function($foo = 'bar', $baz = ...) { return...; }

How would I get 'bar'?

if (is_callable($callable)) {
  return func_get_args();
}

Unfortunately func_get_args() is for the current function, is it possible to get a key value pair of arguments?

Answer 1

You can use reflection:

$f = new ReflectionFunction($callable);
$params = $f->getParameters();
echo $params[0]->getDefaultValue();