PHP | FilesystemIterator next() Function

The FilesystemIterator::next() function is an inbuilt function in PHP which is used to move to the next file element.

Syntax:

void FilesystemIterator::next( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

Below programs illustrate the FilesystemIterator::next() function in PHP:

Program 1:

<?php

// Create new file system iterator
$fileItr = new FilesystemIterator(dirname(__FILE__));

// Check for validity of file iterator
while ($fileItr->valid()) {

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

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

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

?>

Output:

dashboard
img
webalizer
xampp

Program 2:

<?php

// Create new file system iterator
$fileItr = new FilesystemIterator(dirname(__FILE__),
        FilesystemIterator::KEY_AS_FILENAME);

// Loop runs while file iterator is valid
while ($fileItr->valid()) {

    // Check if file iterator is not directory
    if (!$fileItr->isDir()) {

        // Display the key element
        echo $fileItr->key() . "<br>";
    }

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

?>

Output:

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

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

Reference: https://www.php.net/manual/en/filesystemiterator.next.php