class Program {

	void main() {
		$this->b($this->a('First A'), $this->a('Second A'), $this->a('Third A'));
	}

	string a(string $p) {
		mixed[] $backtrace = debug_backtrace();
		if(array_key_exists('args', $backtrace[0])) {
			var_export($backtrace[0]['args']);
		} else {
			print("Cannot aquire arguments\n");
		}
		return $p;
	}

	void b(string $p1, string $p2, string $p3) {
		print("$p1, $p2, $p3");
	}

}