php開啟mysqli擴(kuò)展的方法：首先打開php.ini配置文件；然后找到【extension=php_mysqli.dll】，并取消注釋；最后找到【extension_dir】，設(shè)置ext路徑即可。

具體步驟：

（推薦教程：php圖文教程）

首先打開php.ini配置文件，搜索php_mysqli.dll；

然后設(shè)置extension_dir指令

; Windows Extensions ; Note that ODBC support is built in, so no dll is needed for it. ; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5+) ; extension folders as well as the separate PECL DLL download (PHP 5+). ; Be sure to appropriately set the extension_dir directive. ;一定要適當(dāng)?shù)卦O(shè)置extension_dir指令。

（視頻教程推薦：php視頻教程）

最后在php.ini里面搜索extension_dir；

extension_dir = “G:/web/php7.1/ext”

檢查G:/web/php7.1/ext安裝路徑是否存在php_mysqli.dll（如果不存在應(yīng)該是PHP安裝包損壞，請重新下載）。

完成以上步驟就開啟成功了。