PHP | rewinddir() Function

The rewinddir() function is an inbuilt function in PHP which is used to rewind the directory handle. The rewinddir() function opens a directory and list its files, resets the directory handle, list its files once again, then finally closes the directory handle. The directory handle sent as a parameter to the rewinddir() function and it returns Null on success or False on failure. 

Syntax:

rewinddir ( $dir_handle )

Parameters: The rewinddir() function accepts single parameter $dir_handle. It is a mandatory parameter which specifies the handle resource previously opened by the opendir() function. 

Return Value: It returns Null on success or False on failure. 

Errors And Exceptions:

• If the directory handle parameter is not specified by the user then the last link opened by opendir() is assumed by the rewinddir() function.
• rewinddir() is equivalent to a closedir(), opendir() sequence, but without obtaining a new handle.

Below programs illustrate the rewinddir() function in PHP: 

Program 1: 

<?php

// Open a directory
$dir_handle = opendir("C:/xampp/htdocs/gfg");

// Read the contents of directory
while(($file_name = readdir($dir_handle)) !== false) 
{ 
    echo("File Name: " . $file_name . "<br>");
}

// Rewinding directory
rewinddir($dir_handle);

while(($file_Name = readdir($dir_handle)) !== false) 
{ 
    echo("File Name: " . $file_Name . "<br>");
} 

// Close directory
closedir($dir_handle);
?>

Output:

File Name: .
File Name: ..
File Name: content.xlsx
File Name: gfg.pdf
File Name: image.jpeg
File Name: .
File Name: ..
File Name: content.xlsx
File Name: gfg.pdf
File Name: image.jpeg

Program 2: 

<?php

// Directory path
$dir_name = "C:/xampp/htdocs/gfg";
 
// Open directory and read the content
// of directory
if (is_dir($dir_name)) {
  if ($dir_handle = opendir($dir_name)) {

    // List files in images directory
    while (($file_name = readdir($dir_handle)) !== false) {
      echo "File Name:" . $file_name . "<br>";
    }

    // Rewinding the directory
    rewinddir();

    // List once again files in images directory
    while (($file_name = readdir($dir_handle)) !== false) {
      echo "File Name:" . $file_name . "<br>";
    }

    // Close the directory
    closedir($dir_handle);
  }
}
?>

Output:

filename:.
filename:..
filename:content.xlsx
filename:gfg.pdf
filename:image.jpeg
filename:.
filename:..
filename:content.xlsx
filename:gfg.pdf
filename:image.jpeg

Reference: http://php.net/manual/en/function.rewinddir.php