PHP | FilesystemIterator rewind() Function

Last Updated : 26 Nov, 2019

The FilesystemIterator::rewind() function is an inbuilt function in PHP which is used to rewinds back to the beginning of the file.

Syntax:

void FilesystemIterator::rewind( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

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

Program 1:

<?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 for non-directory element 
    if (!$fileItr->isDir()) { 
  
        // Display the key 
        echo $fileItr->key() . "<br>";  
    } 
  
    // Move to the next element 
    $fileItr->next(); 
} 
  
// Rewind back to start position 
$fileItr->rewind(); 
  
// Display the key 
echo "<br>After using rewind() function <br>"; 
  
echo $fileItr->key(); 
  
?> 

Output:

applications.html
bitnami.css
favicon.ico
geeks.html
gfg.php
index.php

After using rewind() function
applications.html

Program 2:

<?php 
  
// Create new file system iterator 
$fileItr = new FilesystemIterator(__DIR__,  
    FilesystemIterator::CURRENT_AS_PATHNAME); 
  
// Loop runs for each element 
foreach($fileItr as $it) { 
       
    // Display the current element 
    echo $fileItr->current() . "<br>"; 
} 
  
// Rewind back to start position 
$fileItr->rewind(); 
  
// Display the key 
echo "<br>After using rewind() function <br>"; 
  
echo $fileItr->key(); 
  
?> 

Output:

C:\xampp\htdocs\applications.html
C:\xampp\htdocs\bitnami.css
C:\xampp\htdocs\dashboard
C:\xampp\htdocs\favicon.ico
C:\xampp\htdocs\geeks.html
C:\xampp\htdocs\gfg.php
C:\xampp\htdocs\img
C:\xampp\htdocs\index.php
C:\xampp\htdocs\webalizer
C:\xampp\htdocs\xampp

After using rewind() function
C:\xampp\htdocs\applications.html

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

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