如下语句正确：
$db = new mysqli("localhost", "ak", "111111", "welworld"); $db = new mysqli("localhost", "ak", "
$db = new mysqli("localhost", "ak", "111111", "welworld"); $db = new mysqli("localhost", "ak", "
阅读背景：
使用mysqli出错：Call to a member function fetch_row() on a non-object in
来源：互联网
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