note 96326 added to function.scandir

If you have a folder with many files and/or subfolders, doing a recursive scandir will likely either slow down your application, or cause a high rise in RAM consumption due to the large size of the generated array. To help with this, as well as to make processing of files in a folder easier, I wrote a function that reads a folder and its subfolders recursively, and calls a function upon each match. <?php /** * Calls a function for every file in a folder. * * @author Vasil Rangelov a.k.a. boen_robot * * @param string $callback The function to call. It must accept one argument that is a relative filepath of the file. * @param string $dir The directory to traverse. * @param array $types The file types to call the function for. Leave as NULL to match all types. * @param bool $recursive Whether to list subfolders as well. * @param string $baseDir String to append at the beginning of every filepath that the callback will receive. */ function dir_walk($callback, $dir, $types = null, $recursive = false, $baseDir = '') { if ($dh = opendir($dir)) { while (($file = readdir($dh)) !== false) { if ($file === '.' || $file === '..') { continue; } if (is_file($dir . $file)) { if (is_array($types)) { if (!in_array(strtolower(pathinfo($dir . $file, PATHINFO_EXTENSION)), $types, true)) { continue; } } $callback($baseDir . $file); }elseif($recursive && is_dir($dir . $file)) { dir_walk($callback, $dir . $file . DIRECTORY_SEPARATOR, $types, $recursive, $baseDir . $file . DIRECTORY_SEPARATOR); } } closedir($dh); } } ?> Of course, because it is recursive, a folder with many levels of folders could potentially consume lots of memory, but then again, so can every other recursive scandir implementation here. BTW, there's also the RecursiveDirectoryIterator SPL class: http://bg.php.net/manual/en/class.recursivedirectoryiterator.php which, even if using the same approach, will most likely be faster and hold down deeper levels (because it works on the C level), but this one will always work, regardless of settings... even on PHP4. Point is, avoid recursive scandir implementations. ---- Server IP: 217.75.128.29 Probable Submitter: 83.148.87.92 ---- Manual Page -- http://www.php.net/manual/en/function.scandir.php Edit -- https://master.php.net/note/edit/96326 Del: integrated -- https://master.php.net/note/delete/96326/integrated Del: useless -- https://master.php.net/note/delete/96326/useless Del: bad code -- https://master.php.net/note/delete/96326/bad+code Del: spam -- https://master.php.net/note/delete/96326/spam Del: non-english -- https://master.php.net/note/delete/96326/non-english Del: in docs -- https://master.php.net/note/delete/96326/in+docs Del: other reasons-- https://master.php.net/note/delete/96326 Reject -- https://master.php.net/note/reject/96326 Search -- https://master.php.net/manage/user-notes.php