Question

连接到数据库的正确方法是什么？我不明白的错误，但也许我的连接不正确使用我使用的mysqli 这里是我的代码

<?php 
require_once("configur.php"); 

$mysqli = new mysqli(localhost, root, password, user); 

$query_image = 'INSERT INTO fun_table (images1, images2, images3, images4) 
values("' . $_FILES['file1']['name'] . '", 
     "' . $_FILES['file2']['name'] . '", 
     "' . $_FILES['file3']['name'] . '", 
     "' . $_FILES['file4']['name'] . '" 
    )'; 


    if ($mysqli->query($query_image) === TRUE) { 

    echo "<script language='javascript'>\n"; 
    echo "alert('Upload successful!')"; 
    echo "</script>\n"; 
} else { 
    echo "Error updating record: " . $conn->error; 
} 

    $mysqli->close(); 

    ?> 

Answer 1

$库MySQLi =新的mysqli（本地主机，root，密码，用户）;

您需要定义这些或将它们放在引号中。

，如：

$servername = 'localhost'; 
$username = 'user123'; 
$password = 'helloworld'; 
$dbname ="testdatabase"; 

$conn = mysqli_connect($servername, $username, $password, $dbname); 

或者

$conn = mysqli_connect("localhost", "user123", "helloworld", "testdatabase");