<?php$mysqli=new mysqli('localhost','root','root','imooc');var_dump($mysqli);打印结果:object(mysqli)[1] public 'affected_rows' => null public 'client_info' => null public 'connect_errno' => null public 'connect_error' => null ............................. =>null ............................. =>null public 'thread_id' => null public 'warning_count' => null返回的结果为什么全部是NULL?使用print_r()就正常.谢谢!
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