php把数据库内表名字steep2内字段名字为image_name,image_path,image_jiage保存成二维json数组并存为txt文件

可以通过以下PHP代码将"steep2"表中的"image_name"、"image_path"和"image_jiage"字段转化为二维JSON数组，并将结果保存为txt文件：

<?php
$host = "数据库主机名";
$user = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

//连接数据库
$conn = mysqli_connect($host, $user, $password, $dbname);

//查询表中的数据
$query = mysqli_query($conn, "select image_name, image_path, image_jiage from steep2");

//将数据转化为二维数组
$data = array();
while ($row = mysqli_fetch_assoc($query)) {
   $data[] = array("image_name" => $row['image_name'], "image_path" => $row['image_path'], "image_jiage" => $row['image_jiage']);
}

//将数组转化为JSON格式
$json = json_encode($data);

//将JSON字符串写入文件
file_put_contents('data.txt', $json);

//关闭数据库连接
mysqli_close($conn);
?>

注意，这段代码会将表中所有数据转化为JSON格式并保存为txt文件，可能会涉及到隐私或版权问题，请确保遵守相关法律法规。