PHP 7 Data Structures and Algorithms

Finding files and directories using recursion

Quite often, we need to find all the files inside a directory. This includes all subdirectories inside it and also directories inside those subdirectories. As a result, we need a recursive solution to find the list of files from the given directory. The following example will show a simple recursive function to list all the files in a directory:

function showFiles(string $dirName, Array &$allFiles = []) {     $files = scandir($dirName);     foreach ($files as $key => $value) {       $path = realpath($dirName . DIRECTORY_SEPARATOR . $value);       if (!is_dir($path)) {           $allFiles[] = $path;       } else if ($value != "." && $value != "..") {           showFiles($path, $allFiles);           $allFiles[] = $path;       }    }     return; } $files ...