配置php和mysql数据库连接

sudo service mysql start
mysql -u root -p

CREATE DATABASE mydatabase;
CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword';
GRANT ALL PRIVILEGES ON mydatabase.* TO 'myuser'@'localhost';
FLUSH PRIVILEGES;
EXIT;

<?php
$servername = "localhost";
$username = "myuser";
$password = "mypassword";
$dbname = "mydatabase";

// 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);
}
echo "连接成功";
$conn->close();
?>

<?php
$servername = "localhost";
$username = "myuser";
$password = "mypassword";
$dbname = "mydatabase";

// 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);
}

// 预处理语句
$stmt = $conn->prepare("SELECT * FROM users WHERE email = ?");
$stmt->bind_param("s", $email);

$email = "user@example.com";
$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    echo "ID: " . $row["id"]. " - Email: " . $row["email"]. "<br>";
}

$stmt->close();
$conn->close();
?>