An introductory tutorial on how to use the php readdir function

$dir = "readdir/";

// Determine whether it is a directory
if (is_dir($dir)) {
 if ($dh = opendir($dir)) {
 while (($file = readdir($dh)) !== false) {
 echo "filename: $file : filetype: " . filetype($dir . $file) . " ";
 }
 closedir($dh);
 }
}

Example 2, note that the !== operator does not exist before 4.0.0-RC2.

if ($handle = opendir('/path/to/files')) {
 echo "Directory handle: $handle ";
 echo "Files: ";

 /* This is the correct traversal Directory method*/
 while (false !== ($file = readdir($handle))) {
 echo "$file ";
 }

 /* This is the wrong way to traverse the directory*/
 while ($ file = readdir($handle)) {
 echo "$file ";
 }
 closedir($handle);
}

Example 3, readdir() will return . and .. entries, Just filter it out if you don't want to use it. Example 2. List all files in the current directory and remove . and....

if ($handle = opendir('.')) {
 while (false !== ($file = readdir($handle))) {
 if ($file != "." && $ file != "..") {
 echo "$file ";
 }
 }
 closedir($handle);
}

Explanation, readdir must be used in conjunction with opendir.