在Node.js中如何从Php检索数据

Question

I just wanted to retrieve some PHP/Mysql stuff at the beginning of my app (authentication and x and y data) from the users which I later plan to emit to the app.js (one time at the beginning and once the user disconnects update x - y values).

So basically I have set up Nodes.js and understood that some stuff is not possible like before (eg with plain php)

Where I already have a problem is the AJAX php request in the index.html of my nodes Server

Schema:

app.js : pull Data from the /Client/index.html (I think need to do it via sockets)

index.html : get or post data via Ajax to a php file and get the values of the database back to the index.html (JavaScript) then send that data via sockets to the app.js

php: select mysql database retrieve values from mysql parse them via Json and make them available in the index.html file Nodes.js (Client)

Maybe somebody of you have a solution

Nodes.js /Client/index.html :

function checkuser(username, password) {
    var myObj;
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            // Typical action to be performed when the document is ready:
            myObj = xhttp.responseText;
            var i = 0;
            while (i <= myObj.length) {
                //console.log("ASQL found and Auth Username:"+ myObj[i].username)  ;
                console.log(myObj.username);
                i++;
            }
        }
    };
    xhttp.open("GET", "/client/is_user.php?username333=" + username + "&password333=" + password, true);
    xhttp.send();
}

is_user.php :

<?php
require('config_sql.php');
$email = stripslashes($_GET['username333']);
$email = mysqli_real_escape_string($con,$email);
$password369 = stripslashes($_GET['password333']);
$password369 = mysqli_real_escape_string($con,$password369);
$query = "SELECT * FROM `users` WHERE email='$email'
and password='".md5($password369)."'";
$result = mysqli_query($con,$query) or die(mysql_error());
$response = array();
$rows = mysqli_num_rows($result);
while ($row_user= mysqli_fetch_assoc($result))
{
    $response[] = $row;
}
$jsonData = json_encode($response); 
echo $jsonData;
mysqli_close($con);
?>  

atm is not retrieving the username form the created json on the php side. If I console.log(myObj); it's showing the me complete php.file data as plain text if I want to retrieve the username from MySql its saying undefined .

Is the php Interpreter actually working when I post/get via Ajax in a Node.js environment? Normally when I was programming with pure php all the request worked well.

Thank you in advance.

Answer 1

Check you code for recieving result from query:

$rows = mysqli_num_rows($result);
while ($row_user= mysqli_fetch_assoc($result))
{
$response[] = $row;
}

$jsonData = json_encode($response);

Should be so:

$rows = mysqli_num_rows($result);
while ($row_user= mysqli_fetch_assoc($result))
{
$response[] = $row_user;
}

$jsonData = json_encode($response);