How to Use PHP rewinddir() to Reset a Directory Handle

When traversing directories in PHP, the rewinddir() function is essential for resetting the directory handle so you can iterate over the files again from the start.

Basic syntax:

void rewinddir ( resource $dir_handle )

The function accepts an opened directory handle as its argument and moves the internal pointer back to the beginning of the directory without returning any value.

Usage example:

$dir = opendir('/path/to/directory');<br/>if ($dir) {<br/> while (($file = readdir($dir)) !== false) {<br/> echo $file . "\n";<br/> }<br/> rewinddir($dir);<br/> while (($file = readdir($dir)) !== false) {<br/> echo $file . "\n";<br/> }<br/> closedir($dir);<br/>}

In this example, a directory is opened with opendir() , its contents are listed with readdir() , then rewinddir() resets the pointer, allowing the files to be listed a second time before finally closing the handle.

Important notes: rewinddir() can only be used on a directory handle that has been successfully opened; it cannot be applied to file handles. The function does not return a value—it simply resets the internal pointer.

Summary: The rewinddir() function is a useful PHP utility for resetting a directory handle to the start, enabling flexible and repeated file operations within backend scripts.