How to return data to the front desk in PHP

How does PHP return a data to the front desk

1. The front end requests the background interface to obtain data through ajax.

Note: The jQuery.js library needs to be introduced before this code.

$.ajax({
        type: 'POST',
        url: 'db.php',
        data:{
        },
        success: function (data) {
            alert(data);
            }
        }
});

2. The background After php query, it is converted into json data format through json_encode() and returned to the front end

connect_error);
}
//设置查询结果的编码，一定要放在query之前
$conn->query("SET NAMES 'UTF8'");
$result=$conn->query("select * from hotgoods");
//$conn->query()获取的是二进制
//将查询的结果集封装到一个数组里
$css=$result->fetch_all();
//以json的格式发送ajax的success中由data接收
echo json_encode($css);
$conn->close();

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