Variable references in PHP & cannot be used in conjunction with global

Source of the problem, new company Debug.

The code in the program is roughly the following

Class Ci {private static $instance = NULL;        Public $name = ' Hello ';        public $load = null;        Public Function __construct () {self:: $instance = & $this;        $this->load = new Load;        Mlog (self:: $instance, __line__);//other code .... $this->name = ' My name ';    }public static function &getinstance () {return self:: $instance;}        } class My extends ci{public function __construct () {parent::__construct (); $this->model = new model; }} class Model {public Function __construct () {$this->name = _get ();//Nullmlog ("Success, and model->　　Name = {$this->name} ", __line__);}　　} class Load {public $name = ' I am Load class ';p ublic function GetName () {return $this->name;}    } $CI =& get_instance (); Mlog ($CI->name); Hello//Mlog ($CI->load->getname ());　　I am Load class Mlog ($CI, __line__);　　$CI = new My;　　Mlog ($CI, __line__); function _get () {//call static Variablesglobal $CI; Non-boject//return $CI->load->name (); 500return $CI->name;　　NOTICE} function &get_instance () {return ci::getinstance (); } function Mlog ($content, $line = __line__, $display = True) {$next _line = "<br/>"; if (php_sapi_name () = = = ' CLI ')　　{$init = '; $next _line = "\ n";}　　if ($display) {echo $init; echo "In line: $line".　　$next _line;　　Print_r ($content);　　echo $next _line;} }

I believe friends can see that this is part of the CI framework, and developers use the following code in helper for the encapsulation method

<?php    $CI =& get_instance ();    function Demo ()     {         global $CI;         return $CI->mehton;          Notice         //return $CI->class->method;//500       }

The server directly reported 500. Through my first part of the code and comments, it should be possible to draw the following conclusions: In the function scope of the global $ref is not to get the reference, the PHP manual is also described in the details, see. You can't do anything but be careful, learn the basics ^_^

Variable references in PHP & cannot be used in conjunction with global