SFAPIclient/Requests/Hooks.php
public function register($hook, $callback, $priority = 0) {
		if (!isset($this->hooks[$hook])) {
			$this->hooks[$hook] = array();
		}
		if (!isset($this->hooks[$hook][$priority])) {
			$this->hooks[$hook][$priority] = array();
		}

		$this->hooks[$hook][$priority][] = $callback;
	}
public function register($hook, $callback, $priority = 0) {
		if (!isset($this->hooks[$hook])) {
			$this->hooks[$hook] = array();
		}
		if (!isset($this->hooks[$hook][$priority])) {
			$this->hooks[$hook][$priority] = array();
		}

		$this->hooks[$hook][$priority][] = $callback;
	}
public function register ( $ hook , $ callback , $ priority = 0 ) { if ( ! isset ( $ this -> hooks [ $ hook ] ) ) { $ this -> hooks [ $ hook ] = array ( ) ; } if ( ! isset ( $ this -> hooks [ $ hook ] [ $ priority ] ) ) { $ this -> hooks [ $ hook ] [ $ priority ] = array ( ) ; } $ this -> hooks [ $ hook ] [ $ priority ] [ ] = $ callback ; }
Register a callback for a hook

@param string $hook Hook name
@param callback $callback Function/method to call on event
@param int $priority Priority number. <0 is executed earlier, >0 is executed later
Register a callback for a hook