相关疑难解决方法(0)

我想从这段代码重命名picture文件名(没有扩展名)old.jpg.

我picture在父目录中有文件,路径正确

$old="picture";
$new="old.jpg";
rename($old , $new);

或者这个代码

$old="\picture";
$new="\old.jpg";
rename($old , $new);

$old="../picture";
$new="../old.jpg";
rename($old , $new);

$old="../picture";
$new="old.jpg";
rename($old , $new);

$old="./picture";
$new="./old.jpg";
rename($old , $new);

rename("picture", "old.jpg");

但我得到这个错误:

 Warning: rename(picture,old.jpg) [function.rename]: The system cannot find the file specified. (code: 2) in C:\xampp\htdocs\prj\change.php on line 21