Algorithm to get the excel-like column name of a number

Question

I\'m working on a script that generate some Excel documents and I need to convert a number into its column name equivalent. For example:

1 => A
2 => B
         


        

Answer 1

Using PhpSpreadsheet (PHPExcel is deprecated)

// result = 'A'
\PhpOffice\PhpSpreadsheet\Cell\Coordinate::stringFromColumnIndex(1);

Note index 0 results in 'Z'

https://phpspreadsheet.readthedocs.io/en/develop/

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The correct answer (if you use PHPExcel Library) is:

// result = 'A'
$columnLetter = PHPExcel_Cell::stringFromColumnIndex(0); // ZERO-based! 

and backwards:

// result = 1
$colIndex = PHPExcel_Cell::columnIndexFromString('A');