README arrays array array_change_key_case array_combine array_count_values array_fill_keys array_flip array_map array_merge array_pop array_push array_rand array_reverse array_shift array_splice array_sum array_unshift array_walk count datetime localtime strftime time dir chdir chroot closedir getcwd opendir readdir rewinddir scandir filesystem basename chmod dirname is_dir is_executable is_file m