PHP建立多级目录代码

以下是代码片段：
<?php 
function mkpath($path) 
   { 
     $dirs=array(); 
     $path=preg_replace(’/(\/){2,}|(\\\){1,}/’,’/’,$path); //only forward-slash 
     $dirs=explode("/",$path); 
     $path=""; 
     foreach ($dirs as $element) 
         { 
           $path.=$element."/"; 
           if(!is_dir($path)) 
             {  
             if(!mkdir($path)){ echo "something was wrong at : ".$path; return 0; } 
             }           
         } 
     echo("<B>".$path."</B> successfully created"); 
   } 

mkpath("./dir1\dir2/dir3\\\dir4////dir5"); //this works without errors 
?>