php開啟mysqli擴充功能的方法：先開啟php.ini設定檔；然後找到【extension=php_mysqli.dll】，並取消註解；最後找到【extension_dir】，設定ext路徑即可。
具體步驟：
（推薦教學：php圖文教學）
首先打開php.ini設定文件，搜尋php_mysqli.dll;
然後設定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. ;一定要适当地设置extension_dir指令。
（影片教學推薦：php影片教學）
最後在php.ini裡面搜尋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。
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