mysql mysql_error mysqli_connect

<html>
    <head>
        <meta charset="utf-8">
        <title></title>
    </head>
    <body>
        <?php
      
        $con = mysqli_connect("localhost", "root", "root","ehr");
        
        if (!$con) {
      　　　　//转码
             echo 'Could not connect: ' . iconv('gbk', 'utf-8', mysqli_connect_error());
        }else{
             echo 'Connect:Access ';
        }
        ?>
    </body>
</html>

mysql mysql_error mysqli_connect_error 乱码

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