Basic operation of PHP file directory

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1. Get the attribute information of the file

First of all, files have types. Under Linux, there are block (block devices, such as disk partitions, CD-ROM), char (devices input by characters, such as keyboards, printers), dir (directory types, directories are also a kind of files), fifo (named pipes, which means passing information from one process to another), file (ordinary files), and link (links). Similar to the shortcuts under win), unknow (unknown type) 7 categories, under win, there are only 3 categories: file, dir and unknown. Linux scum said that we must do a good job on Linux-_-,. The family was born for Linux.

There are several functions for type acquisition: filetype: get the type; is_file: determine whether it is a normal file; is_link: determine whether it is a link.

There are several functions for getting attributes:

File_exists: determines whether a file or directory exists

Filesize: get file size

Is_readable, is_writable, is_executable: readable, writable, executable

Filectime, filemtime, fileatime: get the creation time (create), modification time (modify) and access time (access) of the file, and all return timestamps

Stat: gets some basic information about the file and returns a mixed array of indexes and associations.

For example, you can determine the file type as follows:

The copy code is as follows: