Php readdir function usage example

This article mainly introduces the usage of the readdir function in php, and describes the specific usage and precautions of the readdir function operation directory in examples, which is of great practical value, for more information about readdir function usage in php, see the following example. Share it with you for your reference. The usage analysis is as follows:

Definition and usage: the readdir () function returns the entries in the directory handle opened by opendir (). if the operation succeeds, the function returns a file name; otherwise, false.

Example 1: The code is as follows:

The code is as follows:

$ Dir = "readdir /";

// Determine whether it is a directory
If (is_dir ($ dir )){
If ($ dh = opendir ($ dir )){
While ($ file = readdir ($ dh ))! = False ){
Echo "filename: $ file: filetype:". filetype ($ dir. $ file )."";
}
Closedir ($ dh );
}
}

Example 2: The code is as follows:

If ($ handle = opendir ('/path/to/Files ')){
Echo "Directory handle: $ handle ";
Echo "Files :";

/* This is the correct way to traverse directories */
While (false! ==( $ File = readdir ($ handle ))){
Echo "$ file ";
}

/* This is the method for mistakenly traversing directories */
While ($ file = readdir ($ handle )){
Echo "$ file ";
}
Closedir ($ handle );
}

Instance 3, readdir () will return. and .. if you do not want them, you only need to filter them out. example 2. list all files in the current directory and remove them. and .., the code is as follows:

The code is as follows:

If ($ handle = opendir ('.')){
While (false! ==( $ File = readdir ($ handle ))){
If ($ file! = "." & $ File! = ".."){
Echo "$ file ";
}
}
Closedir ($ handle );
}

Note: Readdir must be used with opendir.

I hope this article will help you with php programming.