XLSXWriter::addCellFormat PHP Method

    private function addCellFormat($cell_format)
    {
        //for backwards compatibility, to handle older versions
        if ($cell_format == 'string') {
            $cell_format = 'GENERAL';
        } else {
            if ($cell_format == 'integer') {
                $cell_format = '0';
            } else {
                if ($cell_format == 'date') {
                    $cell_format = 'YYYY-MM-DD';
                } else {
                    if ($cell_format == 'datetime') {
                        $cell_format = 'YYYY-MM-DD HH:MM:SS';
                    } else {
                        if ($cell_format == 'dollar') {
                            $cell_format = '[$$-1009]#,##0.00;[RED]-[$$-1009]#,##0.00';
                        } else {
                            if ($cell_format == 'money') {
                                $cell_format = '[$$-1009]#,##0.00;[RED]-[$$-1009]#,##0.00';
                            } else {
                                if ($cell_format == 'euro') {
                                    $cell_format = '#,##0.00 [$€-407];[RED]-#,##0.00 [$€-407]';
                                } else {
                                    if ($cell_format == 'NN') {
                                        $cell_format = 'DDD';
                                    } else {
                                        if ($cell_format == 'NNN') {
                                            $cell_format = 'DDDD';
                                        } else {
                                            if ($cell_format == 'NNNN') {
                                                $cell_format = 'DDDD", "';
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        $cell_format = strtoupper($cell_format);
        $position = array_search($cell_format, $this->cell_formats, $strict = true);
        if ($position === false) {
            $position = count($this->cell_formats);
            $this->cell_formats[] = $this->escapeCellFormat($cell_format);
            $this->cell_types[] = $this->determineCellType($cell_format);
        }
        return $position;
    }