Working with Directories

Working with Directories

In PHP, directories are managed using functions provided by the files system-related extensions. Here are some key functions and concepts related to working with directores in PHP:

These are some of the basic functions and concepts related to working with directories in PHP. They allow you to perform various operations such as listing files, creating directories, checking if a path is a directory, and more.

PHP CHDIR():

The chdir() function changes the current directory.

Syntax:

chdir($directory)

Example: 

<?php
    echo getcwd() . "\n";
    // change to php directory
    chdir('php');
    echo getcwd() . "\n";
?>

Output:

PHP CHROOT():

The chroot() function changes the root directory to the passed directory.

Before using this function on our machine we need to configure –enable-chroot-func.

Syntax:

<?php
    chroot(directory);
?>

Example:

<?php
    chroot('/learncoding/dev/php');
?>

PHP DIR():

The dir() function is used to open a directory handle. This function returns a Directory class object that provides methods for working with the contents of the directory.

Syntax:

<?php
    dirhandle bool dir(string $directory )
?>

Example:

<?php
    $d = dir("/learncoding/dev/php");
    echo "Handle: " . $d->handle . "\n";
    echo "Path: " . $d->path . "\n";
    
    while (false !== ($entry = $d->read())) {
        echo $entry."\n";
    }
    $d->close();
?>

Output:

PHP GETCWD():

The getcwd() function gives the current working directory in PHP.

Syntax:

<?php
	getcwd();
?>

Example:

<?php
	echo getcwd();
?>

PHP OPENDIR():

The opendir() function opens a directory handle in PHP.

Syntax:

<?php
	opendir(path, context)
?>

Example:

<?php
    $dir = opendir("/lerncoding/dev/dev");
    while (($file = readdir($dir)) !== false) {
        echo "filename: " . $file . "<br />";
    }
    closedir($dir);
?>

PHP READDIR():

The readdir() function returns the name of the best entry in a directory in php.

Syntax:

<?php
	readdir(directory)
?>

Example

<?php
    $dir = opendir("/lerncoding/dev/dev");
    while (($file = readdir($dir)) !== false) {
        echo "filename: " . $file . "<br />";
    }
    closedir($dir);
?>

PHP REWINDDIR():

In PHP, the rewinddir() function is used to reset the directory stream represented by the given directory handle (obtained using opendir()) back to the beginning.

Syntax:

<?php
    rewinddir(directory)
?>

Example:

<?php
    $direc = opendir("/learncoding/dev/php");
    
    while (($file =rewinddir($direc)) !== false) {
        echo "filename: " . $file . "<br />";
    }
    
    rewinddir($direc);
    while (($file =rewinddir($direc)) !== false) {
        echo "filename: " . $file . "<br />";
    }
    closedir($direc);
?>

PHP SCANDIR():

The scandir() function is used to return an array of files and directories in a given directory in PHP.

Syntax:

<?php
	scandir(directory, order, context):
?>

Example:

<?php
    $dir = '/learnCoding';
    // acesding order - default
    $store1 = scandir($dir);
    // Sort in decending order
    $store2 = scandir($dir, 1);
    
    print_r($file1);
    print_r($file2);
?>