PHP Tutorial - PHP readdir() Function

Definition

The readdir() function returns the name of the next entry in a directory.

Syntax

PHP readdir() Function has the following syntax.

readdir(dir_handle);

Parameter

Parameter	Is Required	Description
dir_handle	Optional.	Directory handle resource previously opened with opendir(). If this parameter is not specified, the last link opened by opendir() is assumed

Return

PHP readdir() Function returns the entry name (filename) on success. FALSE on failure.

Example

readdir() function takes the handle returned from opendir().

Each time you call readdir(), it returns the filename of the next file in the directory.

Once it reaches the end of the directory, it will return false.

Here is an example of how to list the contents of a directory:


<?PHP//  w ww  .j ava  2 s  . c  om
      $handle = opendir('/path/');

      if ($handle) {
             while (false !== ($file = readdir($handle))) {
                     print "$file \n";
             }
             closedir($handle);
     }
?>

The code above generates the following result.

Example 2

Open a directory, read its contents, then close:


<?php/*from  w  w  w . ja v  a  2 s  .co  m*/
$dir = "/images/";

// Open a directory, and read its contents
if (is_dir($dir)){
  if ($dh = opendir($dir)){
    while (($file = readdir($dh)) !== false){
      echo "filename:" . $file . "\n";
    }
    closedir($dh);
  }
}
?>

Example 3

The following code shows how to get directory recursively.


<?php// ww  w.ja  v a 2 s .c  o m
    function directorySize($directory) {
   
        $directorySize=0;

        // Open the directory and read its contents.
        if ($dh = @opendir($directory)) {

            // Iterate through each directory entry.
            while (($filename = readdir ($dh))) {

                // Filter out some of the unwanted directory entries
                if ($filename != "." && $filename != "..")
                {

                    // File, so determine size and add to total
                    if (is_file($directory."/".$filename))
                        $directorySize += filesize($directory."/".$filename);

                    // New directory, so initiate recursion
                    if (is_dir($directory."/".$filename))
                        $directorySize += directorySize($directory."/".$filename);
                }
            }
        }

        @closedir($dh);
        return $directorySize;

    }

    $directory = '/usr/';
    $totalSize = round((directory_size($directory) / 1048576), 2);
    printf($totalSize);

?>