Php file directory operation functions

Mkdir (); function

Php creates folders and files

/// Create a folder

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Function createdir ($ dir) { If (file_exists ($ dir) & is_dir ($ dir) {// if this file exists and this file is a directory, no action will be taken. } Else { Mkdir ($ dir, 0777); // otherwise, this directory is created. } }

File_exists (); function

File_exists -- check whether a file or directory exists

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<? Php $ Filename = '/path/to/foo.txt '; If (file_exists ($ filename )){ Print "The file $ filename exists "; } Else { Print "The file $ filename does not exist "; } ?>

Is_dir (); function

Is_dir (); test whether the file is a directory.
If it is a directory, true is returned, and false is not returned.

Is_file ();

Is_File ('Destination file path and filename ')
Returns "True" for the file, not "False" for the file ".

Is_link ();
File system function library

Is_link (); test whether the file is a linked file.
True indicates that the specified filename exists and is a symbolic link file.

Rmdir command
Function: delete an empty directory.
Rmdir [option] dirname
-P recursively deletes the directory dirname. When the subdirectory is deleted and its parent directory is empty, it is also deleted. If the entire path is deleted or for some reason

If some paths are retained, the system displays the corresponding information on the standard output.

To clear and remove the Directory, enter:

Rm mydir/* mydir /.*
Rmdir mydir
This command removes the contents from the mydir file and then removes the empty directory. The rm command displays an error about trying to remove the directory. (dot) and. (dot, dot).

Then, run the rmdir command to remove the messages.

Create a file named aa.txt

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Using fpw.fopen('aa.txt ', 'W +'); // create a new file Chmod('aa.txt ', 0777); // sets the permission. Otherwise, it cannot be modified after creation. Delete it. // It seems that this line does not need to be used. Fwrite ($ fp, 'content to write'); // write content Fclose ($ fp); // close the file

Unlink () function
Function: delete an object.
Unlink ($ filename) deletes a file named $ filename.

Delete all objects in a specified directory

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Function dir_clear ($ dir ){ $ Directory = dir ($ dir); // Create a dir class (as described in the Php Manual) to read every file in the directory. Parts While ($ entry = $ directory-> read () {// loop every file and get the file name $ entry $ Filename = $ dir. '/'. $ entry; // obtain the complete file name, with the path If (is_file ($ filename) {// if it is a file, delete it. @ Unlink ($ filename );         }     } $ Directory-> close (); // close the class for reading directory files Result (); }

List all file programs in directories that contain subdirectories

 

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<? Php /* * PHP reads the file functions in the directory and its subcategories. **/ $ Files = getFile ("images"); // call a function Foreach ($ files as $ name ){ Echo "$ name". "<br> "; }   Function getFile ($ dir ){ $ Files = array (); If (is_file ($ dir) {// if the specified path is a file, directly return Return $ dir;  }   $ Hande = opendir ($ dir );   If ($ hande ){ While (false! ==( $ Ufile = readdir ($ hande) {// if the directory is read successfully If ($ ufile! = "." & $ Ufile! = ".."){ $ Filename = $ dir. "/". $ ufile; If (is_file ($ filename )){ $ Files [] = $ filename; } Else { $ Files = array_merge ($ files, getFile ($ filename ));     }    } } // End While Closedir ($ hande ); } // End if   Return $ files; } ?>

This method is strongly recommended to delete all files in the specified directory and all folders and their own !!!
 

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Function rmdir_tree ($ dirname) // defines a function rmdir_tree. The name of the object to be deleted is $ dirname. { $ Handle = opendir ($ dirname); // open the folder named $ dirname While ($ file = readdir ($ handle) // run the loop to read the opened folder { If ($ file = ".") | ($ file = "..") continue; // conditions for continued running. if this condition is not met, it will not run. $ Fullname = $ dirname. "/". $ file; // Complete file name (including path) If (filetype ($ fullname) = "dir ") Rmdir_tree ($ fullname); // call the defined function to implement recursion Else Unlink ($ fullname); // delete an object } Closedir ($ handle); // Close the opened folder Rmdir ($ dirname); // delete itself (folder) }