PHP选择多个表作为数组

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询多个表
$sql = "SELECT * FROM table1, table2, table3 WHERE table1.id = table2.id AND table2.id = table3.id";
$result = $conn->query($sql);

// 将结果存储在数组中
$data = array();
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $data[] = $row;
    }
}

// 关闭数据库连接
$conn->close();

// 打印结果
print_r($data);
?>