PHP | DirectoryIterator __construct() Function

The DirectoryIterator::__construct() function is an inbuilt function in PHP which is used to construct a new directory iterator from a path. 

Syntax:

public DirectoryIterator::__construct( string $path )

Parameters: This function accepts single parameter $path which holds the path of the directory to traverse. 

Return Value: This function does not return any value. 

Below programs illustrate the DirectoryIterator::__construct() function in PHP: 

Program 1: 

<?php

// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));

// Loop runs for each element of directory
foreach ($directory as $dir) {

    // Check if directory element is valid
    if ($dir->valid()) {

        // Display the filename
        echo $dir->getFilename() . "<br>";
    }
}
?>

Output:

.
..
applications.html
bitnami.css
dashboard
favicon.ico
geeks.PNG
gfg.php
img
index.php
Sublime Text Build 3211 x64 Setup.exe
webalizer
xampp

Program 2: 

<?php

// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));

// Loop runs while directory is valid
while ($directory->valid()) {

    // Check for directory element
    if ($directory->isDir()) {

        // Display the filename
        echo $directory->getFilename() . "<br>";
    }

    // Move to the next element
    $directory->next();
}
?> 

Output:

.
..
dashboard
img
webalizer
xampp

Note: The output of this function depends on the content of server folder. 

Reference: https://www.php.net/manual/en/directoryiterator.construct.php