Question

debug_backtrace() is only returning args array with names populated only with numbers, so maybe there are other hacks to get to parent scope context ?

Answer 1

Check out Reflector Function

http://www.php.net/manual/en/class.reflectionfunction.php

Example

function test($test){
    return $test;
}


$method = new ReflectionFunction('test');
var_dump( $method->getParameters() ); 

foreach($params as $param){
    echo $param->name.'<br/>';
}

Class Example using ReflectionMethod

class MyClass{

function test($test,$world){
    return $test;
}
}

$method = new ReflectionMethod('MyClass','test');
$params = $method->getParameters();

foreach($params as $param){
    echo $param->name.'<br/>';
}