使用php从while循环语句中的不同表中获取值

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

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 编写SQL查询语句
$sql = "SELECT t1.column1, t2.column2 FROM table1 t1 JOIN table2 t2 ON t1.id = t2.id";

// 执行查询
$result = $conn->query($sql);

// 循环遍历结果集
while ($row = $result->fetch_assoc()) {
    // 处理数据
    $value1 = $row['column1'];
    $value2 = $row['column2'];
    // 其他操作...
}

// 关闭数据库连接
$conn->close();
?>