PHP Directories

Directories are predefined features of PHP, These features are used to control & make all operations on system directories.

These provide such operations like open, read, write & change directory, etc.

Example-1

<?php
$dir = "/etc/php5/";

// Open a known directory, and proceed to read its contents
if (is_dir($dir)) {
    if ($dh = opendir($dir)) {
        while (($file = readdir($dh)) !== false) {
            echo "filename: $file : filetype: " . filetype($dir . $file) . "\n";
        }
        closedir($dh);
    }
}
?>

Output

Example-2

<?php

if ($handle = opendir('/path/to/files')) {
    echo "Directory handle: $handle\n";
    echo "Entries:\n";

    /* This is the correct way to loop over the directory. */
    while (false !== ($entry = readdir($handle))) {
        echo "$entry\n";
    }

    /* This is the WRONG way to loop over the directory. */
    while ($entry = readdir($handle)) {
        echo "$entry\n";
    }

    closedir($handle);
}
?>

Requirements

No external libraries are needed to build this extension.

Installation

There is no installation needed to use these functions; they are part of the PHP core.

Runtime Configuration

This extension has no configuration directives defined in php.ini.

Resource Types

This extension has no resource types defined.

Predefined Constants

• DIRECTORY_SEPARATOR
• PATH_SEPARATOR                      Semicolon on Windows, colon otherwise.
• SCANDIR_SORT_ASCENDING      Available since PHP 5.4.0.
• SCANDIR_SORT_DESCENDING    Available since PHP 5.4.0.
• SCANDIR_SORT_NONE                Available since PHP 5.4.0.

Directory Functions

• chdir — Change directory
• chroot — Change the root directory
• closedir — Close directory handle
• dir — Return an instance of the Directory class
• getcwd — Gets the current working directory
• opendir — Open directory handle
• readdir — Read entry from directory handle
• rewinddir — Rewind directory handle
• scandir — List files and directories inside the specified path