php判断是否引入某文件

Code：

 /* 判断是否引入了公共文件demo.php */
 $include_files = get_included_files();
 $include_files_exist = 0 ;
 foreach($include_files as $include_files_val){
     if(strpos($include_files_val,'demo.php') !== false ){
         $include_files_exist = 1;
     }
 }
 if($include_files_exist != 1){
     include_once('demo.php');
 }

Command：

get_included_files();

strpos()

include_once();

其实，当时是因为重复引入同一文件引起报错，解决办法很简单，直接改为include_once() 或 require_once() 就OK。