Horde_Data_Csv::nextStep PHP Method

    public function nextStep($action, array $param = array())
    {
        switch ($action) {
            case Horde_Data::IMPORT_FILE:
                parent::nextStep($action, $param);
                /* Move uploaded file so that we can read it again in the next
                   step after the user gave some format details. */
                $file_name = $_FILES['import_file']['tmp_name'];
                if (($file_data = file_get_contents($file_name)) === false) {
                    throw new Horde_Data_Exception(Horde_Data_Translation::t("The uploaded file could not be saved."));
                }
                /* Do charset checking now, if requested. */
                if (isset($param['check_charset'])) {
                    $charset = isset($this->_vars->charset) ? Horde_String::lower($this->_vars->charset) : 'utf-8';
                    switch ($charset) {
                        case 'utf-8':
                            $error = !Horde_String::validUtf8($file_data);
                            break;
                        default:
                            $error = $file_data != Horde_String::convertCharset(Horde_String::convertCharset($file_data, $charset, 'UTF-8'), 'UTF-8', $charset);
                            break;
                    }
                    if ($error) {
                        $e = new Horde_Data_Exception_Charset(Horde_Data_Translation::t("Incorrect charset given for the data."));
                        $e->badCharset = $charset;
                        throw $e;
                    }
                }
                $this->storage->set('charset', $this->_vars->charset);
                $this->storage->set('file_data', $file_data);
                /* Read the file's first two lines to show them to the user. */
                $first_lines = '';
                if ($fp = @fopen($file_name, 'r')) {
                    for ($line_no = 1, $line = fgets($fp); $line_no <= 3 && $line; $line_no++, $line = fgets($fp)) {
                        $line = Horde_String::convertCharset($line, $this->_vars->charset, 'UTF-8');
                        $first_lines .= Horde_String::truncate($line);
                        if (Horde_String::length($line) > 100) {
                            $first_lines .= "\n";
                        }
                    }
                }
                $this->storage->set('first_lines', $first_lines);
                /* Import the first line to guess the number of fields. */
                if ($first_lines) {
                    rewind($fp);
                    $line = self::getCsv($fp);
                    if ($line) {
                        $this->storage->set('fields', count($line));
                    }
                }
                return Horde_Data::IMPORT_CSV;
            case Horde_Data::IMPORT_CSV:
                $this->storage->set('header', $this->_vars->header);
                $import_mapping = array();
                if (isset($param['import_mapping'])) {
                    $import_mapping = $param['import_mapping'];
                }
                $file_name = Horde_Util::getTempFile('import');
                file_put_contents($file_name, $this->storage->get('file_data'));
                $this->storage->set('data', $this->importFile($file_name, $this->_vars->header, $this->_vars->sep, $this->_vars->quote, $this->_vars->fields, $import_mapping, $this->storage->get('charset'), $this->storage->get('crlf')));
                $this->storage->set('map');
                return Horde_Data::IMPORT_MAPPED;
            default:
                return parent::nextStep($action, $param);
        }
    }