wamp / php错误致命错误：第9行的C：\ wamp \ www \ finalproject \ Connections \ Main_DB.php中找不到类'mysqli_connect'[重复]

Question

你好，有人可以帮助我解决这个问题。

这是我的连接字符串：

<?php

    #FileName = "Connection_php_mysql.htm"
    #Type = "MYSQL"
    #HTTP = "true"

    $hostname_Main_DB = "localhost";
    $database_Main_DB = "mydb";
    $username_Main_DB = "root";
    $password_Main_DB = "";

    $con = new mysqli_connect($hostname_Main_DB,$username_Main_DB. $password_Main_DB, $database_Main_DB) or die ( "Failed to connect to MySQL: " . mysqli_connect_errno());     $db=mysqli_select_db($database_Main_DB,$con) or die( "Failed to connect to MySQL: " .     mysqli_connect_errno());
?>

我已经安装了wamp 服务器并启用了mysqli 扩展。

希望您能帮我解决这个问题，

Tnx，尤塔姆

Answer 1

$con = mysqli_connect(..);

删除新关键字。

Answer 2

代码应该是

<?php

    #FileName = "Connection_php_mysql.htm"
    #Type = "MYSQL"
    #HTTP = "true"

    $hostname_Main_DB = "localhost";
    $database_Main_DB = "mydb";
    $username_Main_DB = "root";
    $password_Main_DB = "";

    $con = mysqli_connect($hostname_Main_DB,$username_Main_DB,$password_Main_DB, $database_Main_DB) or die ( "Failed to connect to MySQL: " . mysqli_connect_errno());

    $db=mysqli_select_db($database_Main_DB,$con) or die( "Failed to connect to MySQL: ".mysqli_connect_errno());
?>

您应该删除“新”。更多信息请阅读this

编辑：-

您还在两个变量之间添加了.，应该是,

$username_Main_DB. $password_Main_DB 将其替换为 $username_Main_DB,$password_Main_DB