Efficient and fast xlsx file extension.
xlswriter is a PHP C Extension that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file.
  Writer
  - 100% compatible Excel XLSX files.
  - Full Excel formatting.
  - Merged cells.
  - Defined names.
  - Autofilters.
  - Charts.
  - Data validation and drop down lists.
  - Worksheet PNG/JPEG images.
  - Memory optimization mode for writing large files.
  - Works on Linux, FreeBSD, OpenBSD, OS X, Windows.
  - Compiles for 32 and 64 bit.
  - FreeBSD License.
  - The only dependency is on zlib.
  Reader
  - Full read data
  - Cursor read data
  - Read by data type
  - Xlsx to csv
License: BSD license