File manipulation functionalities

 The following are functions to manipulate with file in PHP.

//Get list of folder in a another folder

function get_list_folder($folder = '', $levels = 100){
    if (empty($folder)) return false;
    if (!$levels) return false;
    $folders = array();
    if ($dir = @opendir($folder)) {
        while (($file = readdir($dir) ) !== false) {
            if (in_array($file, array('.', '..')))
                continue;
            if (is_dir($folder . '/' . $file)) {
                $folders2 = self::get_list_folder($folder . '/' . $file, $levels - 1);
                if ($folders2){
                    $folders = array_merge($folders, $folders2);
                }else {
                    $folders[] = $folder . '/' . $file . '/';
                }
            }
        }
    }
    @closedir($dir);
    return $folders;
}

//Get list of files in a folder
function get_list_files($folder = '', $levels = 100) {
    if (empty($folder)) return false;
    if (!$levels) return false;
    $files = array();
    if ($dir = @opendir($folder)) {
        while (($file = readdir($dir) ) !== false) {
            if (in_array($file, array('.', '..')))
                continue;
            if (is_dir($folder . '/' . $file)) {
                $files2 = self::get_list_files($folder . '/' . $file, $levels - 1);
                if ($files2)
                    $files = array_merge($files, $files2);
                else
                    $files[] = $folder . '/' . $file . '/';
            } else {
                $files[] = $folder . '/' . $file;
            }
        }
    }
    @closedir($dir);
    return $files;
}
//Get list of image
function get_list_images($path, $level = 100){
    $list       = array();
    $_list      = self::get_list_files($path, $level);
    $list       = preg_grep('/\.(jpg|jpeg|png|gif)(?:[\?\#].*)?$/i', $_list);
    return $list;
}

// Get list of SVG files
function get_list_svgs($path, $level = 100){
    $list       = array();
    $_list      = self::get_list_files($path, $level);
    $list       = preg_grep('/\.(svg)(?:[\?\#].*)?$/i', $_list);
    return $list;
}

//Get list of files by type of file
function get_list_files_by_type($path, $level = 100, $type){
    $list       = array();
    $_list      = self::get_list_files($path, $level);
    $list       = preg_grep('/\.(' . $type . ')(?:[\?\#].*)?$/i', $_list);
    return $list;
}
//Delete a folder
function delete_folder($path) {
    if (is_dir($path) === true) {
        $files = array_diff(scandir($path), array('.', '..'));
        foreach ($files as $file) {
            self::delete_folder(realpath($path) . '/' . $file);
        }
        return rmdir($path);
    } else if (is_file($path) === true) {
        return unlink($path);
    }
    return false;
}

//Copy directory
function copy_dir($src, $dst) {
    if (file_exists($dst)) self::delete_folder($dst);
    if (is_dir($src)) {
        wp_mkdir_p($dst);
        $files = scandir($src);
        foreach ($files as $file){
            if ($file != "." && $file != "..") self::copy_dir("$src/$file", "$dst/$file");
        }
    } else if (file_exists($src)) copy($src, $dst);
}

//Create dir in wp
function mkdir( $dir ){
    if (!file_exists($dir)) {
        wp_mkdir_p($dir);
    }
}