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<?php
namespace Box\Spout\Writer\Common\Helper;
/**
* Class CellHelper
* This class provides helper functions when working with cells
*/
class CellHelper
{
/** @var array Cache containing the mapping column index => column letters */
private static $columnIndexToColumnLettersCache = [];
/**
* Returns the column letters (base 26) associated to the base 10 column index.
* Excel uses A to Z letters for column indexing, where A is the 1st column,
* Z is the 26th and AA is the 27th.
* The mapping is zero based, so that 0 maps to A, B maps to 1, Z to 25 and AA to 26.
*
* @param int $columnIndexZeroBased The Excel column index (0, 42, ...)
*
* @return string The associated cell index ('A', 'BC', ...)
*/
public static function getColumnLettersFromColumnIndex($columnIndexZeroBased)
{
$originalColumnIndex = $columnIndexZeroBased;
// Using isset here because it is way faster than array_key_exists...
if (!isset(self::$columnIndexToColumnLettersCache[$originalColumnIndex])) {
$columnLetters = '';
$capitalAAsciiValue = \ord('A');
do {
$modulus = $columnIndexZeroBased % 26;
$columnLetters = \chr($capitalAAsciiValue + $modulus) . $columnLetters;
// substracting 1 because it's zero-based
$columnIndexZeroBased = (int) ($columnIndexZeroBased / 26) - 1;
} while ($columnIndexZeroBased >= 0);
self::$columnIndexToColumnLettersCache[$originalColumnIndex] = $columnLetters;
}
return self::$columnIndexToColumnLettersCache[$originalColumnIndex];
}
}
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