在php中选择查询mysql后运行插入查询

<?php
// 连接MySQL数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

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

// 选择查询MySQL
$sql = "SELECT * FROM 表名 WHERE 条件";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出每行数据
    while($row = $result->fetch_assoc()) {
        echo "字段1: " . $row["字段1"]. " - 字段2: " . $row["字段2"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 运行插入查询
$sql = "INSERT INTO 表名 (字段1, 字段2) VALUES ('值1', '值2')";
if ($conn->query($sql) === TRUE) {
    echo "插入成功";
} else {
    echo "插入失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>