php生成excel列名超过26列大于Z时的解决方法_php技巧

public static function stringFromColumnIndex($pColumnIndex = 0) 
{ 
        //  Using a lookup cache adds a slight memory overhead, but boosts speed 
        //  caching using a static within the method is faster than a class static, 
        //      though it's additional memory overhead 
        static $_indexCache = array(); 
  
        if (!isset($_indexCache[$pColumnIndex])) { 
            // Determine column string 
            if ($pColumnIndex                 $_indexCache[$pColumnIndex] = chr(65 + $pColumnIndex); 
            } elseif ($pColumnIndex                 $_indexCache[$pColumnIndex] = chr(64 + ($pColumnIndex / 26)) . chr(65 + $pColumnIndex % 26); 
            } else {
                $_indexCache[$pColumnIndex] = chr(64 + (($pColumnIndex - 26) / 676)) . chr(65 + ((($pColumnIndex - 26) % 676) / 26)) . chr(65 + $pColumnIndex % 26); 
            } 
        } 
        return $_indexCache[$pColumnIndex]; 
}

PHPExcel_Cell::stringFromColumnIndex($i); // 从o开始

PHPExcel_Cell::columnIndexFromString('AA');