Get all the files and directories recursively.

get_all_files_in_dir.php

<?php
/**
 * Get all the files and directories recursively.
 *
 * @param       $dir
 * @param array $results
 *
 * @return array
 */
function getDirContents( $dir, &$results = array() ) {
    $files = scandir( $dir );

    foreach ( $files as $key => $value ) {
        $path = realpath( $dir . DIRECTORY_SEPARATOR . $value );
        if ( ! is_dir( $path ) ) {
            $results[] = $path;
        } else if ( $value != "." && $value != ".." ) {
            getDirContents( $path, $results );
            $results[] = $path;
        }
    }

    return $results;
}