云虚拟主机配置php

# 通过SSH连接到服务器
ssh username@your_server_ip

# 安装所需的PHP版本
sudo apt-get update
sudo apt-get install php7.4

# 切换PHP版本
sudo update-alternatives --config php

# 修改文件权限
chmod 644 /path/to/your/file.php

# 修改目录权限
chmod 755 /path/to/your/directory

// 检查数据库配置文件
// 通常位于 /etc/php/7.4/apache2/php.ini 或 /etc/php/7.4/fpm/php.ini
extension=mysqli
mysqli.default_host = "your_database_host"
mysqli.default_user = "your_database_user"
mysqli.default_pw = "your_database_password"
mysqli.default_port = "your_database_port"

<?php
$servername = "your_database_host";
$username = "your_database_user";
$password = "your_database_password";
$dbname = "your_database_name";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询数据
$sql = "SELECT id, name FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();
?>