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<?php
namespace Box\Spout\Writer\Common\Helper;
/**
* Class CellHelper
* This class provides helper functions when working with cells
*
* @package Box\Spout\Writer\Common\Helper
*/
class CellHelper
{
/** @var array Cache containing the mapping column index => cell index */
private static $columnIndexToCellIndexCache = [];
/**
* Returns the cell index (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 $columnIndex The Excel column index (0, 42, ...)
* @return string The associated cell index ('A', 'BC', ...)
*/
public static function getCellIndexFromColumnIndex($columnIndex)
{
$originalColumnIndex = $columnIndex;
// Using isset here because it is way faster than array_key_exists...
if (!isset(self::$columnIndexToCellIndexCache[$originalColumnIndex])) {
$cellIndex = '';
$capitalAAsciiValue = ord('A');
do {
$modulus = $columnIndex % 26;
$cellIndex = chr($capitalAAsciiValue + $modulus) . $cellIndex;
// substracting 1 because it's zero-based
$columnIndex = intval($columnIndex / 26) - 1;
} while ($columnIndex >= 0);
self::$columnIndexToCellIndexCache[$originalColumnIndex] = $cellIndex;
}
return self::$columnIndexToCellIndexCache[$originalColumnIndex];
}
/**
* @param $value
* @return bool Whether the given value is considered "empty"
*/
public static function isEmpty($value)
{
return ($value === null || $value === '');
}
/**
* @param $value
* @return bool Whether the given value is a non empty string
*/
public static function isNonEmptyString($value)
{
return (gettype($value) === 'string' && $value !== '');
}
/**
* Returns whether the given value is numeric.
* A numeric value is from type "integer" or "double" ("float" is not returned by gettype).
*
* @param $value
* @return bool Whether the given value is numeric
*/
public static function isNumeric($value)
{
$valueType = gettype($value);
return ($valueType === 'integer' || $valueType === 'double');
}
/**
* Returns whether the given value is boolean.
* "true"/"false" and 0/1 are not booleans.
*
* @param $value
* @return bool Whether the given value is boolean
*/
public static function isBoolean($value)
{
return gettype($value) === 'boolean';
}
}