mysqli_connect() 函数打开一个到 MySQL 服务器的新的连接。

<?php 
$con=mysqli_connect("localhost","wrong_user","my_password","my_db"); 
// 检查连接 
if (!$con) 
{ 
    die("连接错误: " . mysqli_connect_error()); 
} 
?>

// 修改数据库连接字符集为 utf8
mysqli_set_charset($con,"utf8");

// 执行查询
mysqli_query($con,"SELECT * FROM websites");

mysqli_affected_rows(connection);

mysqli_insert_id(connection);

mysqli_fetch_assoc(result);

mysqli_free_result(result);

mysqli_close(connection);