php - LAMP Server will not allow connections to either local or remote MySQL Server

Question

I posted another question that is similar to this but I believe this to be a separate issue. Accessing MySql Database from PHP file on local host

While trying to execute the following line

$db = mysql_connect('ipaddress','username','password!!') or die("Connection error");

On my local raspberry pi lamp web server I get a internal 500 server error. It doesn't matter if I try and connect to an external Database or the local one that I want. I get the same internal 500 error response.

update:

After checking the error.log file it appears this is the reported error

"Call to undefined function mysql_connect() in [path]"

Answer 1

你没有为php安装mysql，或者php找不到安装。创建一个 phpinfo() 站点并在那里查找 mysql。如果不存在，请尝试执行 apt-get install php5-mysql

Answer 2

mysql_connect 已弃用，很快就会从 PHP 主干中删除，如果这是一个非常新的 PHP 或 MySQL 安装，可能会出现问题，那么新的开发真的应该使用 MySQLi 或 PDO 库来完成

这就是你在 MySQLi 中的做法（面向对象）

$mysqli = new MySQLi($db_server, $db_username, $db_password, $db_database);

（程序）

$mysqli = mysqli_connect("example.com", "user", "password", "database");

还要确保 DB 用户有权访问相关数据库，如果您访问远程数据库，您还必须将源添加到 mySQL 服务器（域或 IP 地址）的批准列表中。

500 错误很难诊断，500 仅仅意味着服务器不理解，或者无法处理请求（它是当其他错误不适用时发生的错误）好消息是服务器实际上正在接收请求。