array_ Pop error: only variables should be passed by reference

Code execution echo array_pop(explode("\\", 'app\admin\controller\test')); Report errors ：

stay windows Environmental Science cmd Normal display if executed in ：

  stay linux The first exception is displayed when executing in the environment , But if you switch to php5.5 It's normal ：

  It may be judged that this error report php The version is about .

Error correction , take explode Assign a value to a variable .