Detailed explanation of PHP file system management

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File concept:

The first one is a Windows file, and the other PHP file is based on LINUX , the two are different. The files we are talking about based on Windows pages can be folders (that is, directories) or files, and PHP must have both. It contains two types of directories and files.

1. Determine the file type

(1) Get the file type filetype("./images")

For example: var_dump(filetype("./img")); //Return the file type, directory or file, if it is a directory, return dir, if it is a file, return file;

(2) Determine whether it is a directory type is_dir("")

Determine whether it is a file type is_file("")

For example: var_dump(is_dir(" ./img/11.png"));

var_dump(is_file("./img/11.png"));

2.File attributes

(1) File last access time fileatime("") The return value is the timestamp

File creation time filectime("")

File modification time filemtime("")

File size filesize("")

Whether the file already exists file_exists("") This is more commonly used

For example: var_dump(date("Y-m-d H:i:s",fileatime("./img/11.png"))); returns the normal time of the last access

3. File path

(1)Current path ./ ./ ../ For example: ../img

(3) Root path

Page mode: the root directory is wwwFor example :/1220/wenjian/img/11.png
php mode: the root directory is the disk, that is, the operating system root

(4) Get the root directory of the server

$_SERVER['DOCUMENT_ROOT']For example: echo $_SERVER['DOCUMENT_ROOT'];

(5) Get the file name from the path

basename("path")For example: echo basename("/wamp/www/1220/wenjian/img /11.png");
Returns 11.png

For example: echo basename("/wamp/www/1220/wenjian /img/11.png",".png");
Returns the directory name in the path 11

dirname ("path")For example: echo dirname("/wamp/www/1220/wenjian/img/11.png");
The returned is img

(7) Return array

pathinfo("path")　

realpath ("path")For example: echo realpath("./img/11.png");//Convert relative path to absolute path
The obtained value is /wamp/www/1220/wenjian/img /11.png

4. Directory operation

(1) Traverse the array glob("./fenye/*.php")

Example: Give you a folder and return the number of all files in the folder

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