sap .net 服务 注释 display and name 大致 href
问题来源,新公司debug。
程序中代码大致如下
- 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()
- {
- $this->name = _get(); // null
- mlog("success, and model->name = {$this->name}", __LINE__);
- }
- }
- class Load {
- public $name = ‘I am Load class‘;
- public 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 variables
- global $CI; //non-boject
- //return $CI->load->name(); // 500
- return $CI->name; //notice
- }
- function &get_instance()
- {
- return Ci::getInstance();
- }
- function mlog($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;
- }
- }
相信朋友们可以看出来,这是CI框架中的一部分,开发者为了封装方法所以在helper中使用如下代码
- <?php
- $CI =& get_instance();
- function demo()
- {
- global $CI;
- //return $CI->mehton; //notice
- //return $CI->class->method;//500
- }
服务器直接报了500。通过我第一部分的代码与注释,应该可以得出以下结论:在function的scope中global $ref是拿不到该引用的,php手册中也有说明,详情请看。干啥都不能不细心啊,好好学习基础^_^
php中变量引用&不可与global共同使用
来源: http://www.bubuko.com/infodetail-2319300.html