Available border styles
| Style name | PHPExcel class reference |
|---|
| none | PHPExcel_Style_Border::BORDER_NONE |
| dashDot | PHPExcel_Style_Border::BORDER_DASHDOT |
| dashDotDot | PHPExcel_Style_Border::BORDER_DASHDOTDOT |
| dashed | PHPExcel_Style_Border::BORDER_DASHED |
| dotted | PHPExcel_Style_Border::BORDER_DOTTED |
| double | PHPExcel_Style_Border::BORDER_DOUBLE |
| hair | PHPExcel_Style_Border::BORDER_HAIR |
| medium | PHPExcel_Style_Border::BORDER_MEDIUM |
| mediumDashDot | PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT |
| mediumDashDotDot | PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT |
| mediumDashed | PHPExcel_Style_Border::BORDER_MEDIUMDASHED |
| slantDashDot | PHPExcel_Style_Border::BORDER_SLANTDASHDOT |
| thick | PHPExcel_Style_Border::BORDER_THICK |
| thin | PHPExcel_Style_Border::BORDER_THIN |