php產生excel列名，超過26列大於Z問題解決辦法

這是phpExcel類中的方法。今天查到了，記錄一下備忘。

代碼如下

複製代碼

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 < 26) {                 $_indexCache[$pColumnIndex] = chr(65 + $pColumnIndex);             } elseif ($pColumnIndex < 702) {                 $_indexCache[$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];     }

將列的數字序號轉成字母使用：

代碼如下	複製代碼
PHPExcel_Cell::stringFromColumnIndex($i); // 從o開始

將列的字母轉成數字序號使用：

代碼如下	複製代碼
PHPExcel_Cell::columnIndexFromString(‘AA’);