Fatal error: Uncaught TypeError: array_shift(): Argument #1 ($array) must be of type array, null given in I:\www\php_vendor_tests\vendor\lsolesen\pel\examples\dirsort.php:45 Stack trace: #0 I:\www\php_vendor_tests\vendor\lsolesen\pel\examples\dirsort.php(45): array_shift(NULL) #1 {main} thrown in I:\www\php_vendor_tests\vendor\lsolesen\pel\examples\dirsort.php on line 45