same_name.php

<?php

class Nyan {

	static public function static_method_nyan() {
		echo 'static nyan', "\n";
	}

	static public function __callStatic($name, $args) {
		$method_name = 'static_method_' . $name;

		if (method_exists(__CLASS__, $method_name)) {
			return call_user_func_array(array(__CLASS__, $method_name), $args);
		} else {
			trigger_error('Call to undefined method ' . __CLASS__ . "::{$name}()", E_USER_ERROR);
		}
	}

	public function instance_method_nyan() {
		echo 'instance nyan', "\n";
	}

	public function __call($name, $args) {
		$method_name = 'instance_method_' . $name;

		if (method_exists($this, $method_name)) {
			return call_user_func_array(array($this, $method_name), $args);
		} else {
			trigger_error('Call to undefined method ' . __CLASS__ . "::{$name}()", E_USER_ERROR);
		}
	}

}

same_name_example.php

<?php

Nyan::nyan(); #=> static nyan

$nyan = new Nyan();
$nyan->nyan(); #=> instance nyan