JSON returns all NULL - php

Question

I am trying to get a JSON from a MySQL database, but it does not recover anything. Here my code:
db_config.php
<?php
/*
* All database connection variables
*/
define('DB_USER', "root"); // db user
define('DB_PASSWORD', ""); // db password (mention your db password here)
define('DB_DATABASE', "biblioapp"); // database name
define('DB_SERVER', "localhost"); // db server
?>
db_connect
<?php
/**
* A class file to connect to database
*/
class DB_CONNECT{
// constructor
function __construct() {
// connecting to database
$this->connect();
}
// destructor
function __destruct() {
// closing db connection
$this->close();
}
/**
* Function to connect with database
*/
function connect() {
// import database connection variables
require_once __DIR__ . '/db_config.php';
// Connecting to mysql database
$con = mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());
// Selecing database
$db = mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());
// returing connection cursor
return $con;
}
/**
* Function to close db connection
*/
function close() {
// closing db connection
mysql_close();
}
}
?>
get_products_details.php
<?php
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// check for post data
$search = '';
if (isset($_POST['search'])){
$search = strtolower($_POST['search']);
// get a product from products table
$result = mysql_query("SELECT * FROM registres WHERE titol LIKE '%".$search."%' OR autor LIKE '%".$search."%'");
if (!empty($result)) {
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$product = array();
$product["id"] = $result["id"];
$product["titol"] = $result["titol"];
$product["autor"] = $result["autor"];
$product["descripcion"] = $result["descripcion"];
// success
$response["success"] = 1;
// user node
$response["product"] = array();
array_push($response["product"], $product);
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
get_all_products.php
<?php
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT *FROM registres") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["registres"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$product = array();
$product["id"] = $result["id"];
$product["titol"] = $result["titol"];
$product["autor"] = $result["autor"];
$product["descripcion"] = $result["descripcion"];
// push single product into final response array
array_push($response["registres"], $product);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No products found";
// echo no users JSON
echo json_encode($response);
}
?>
If I go to localhost/json/get_product_details.php I receive this:
{"success":0,"message":"Required field(s) is missing"}
If i go to localhost/json/get_all_products.php I receive this:
{"registres":[{"id":null,"titol":null,"autor":null,"descripcion":null},{"id":null,"titol":null,"autor":null,"descripcion":null},{"id":null,"titol":null,"autor":null,"descripcion":null},{"id":null,"titol":null,"autor":null,"descripcion":null},{"id":null,"titol":null,"autor":null,"descripcion":null}],"success":1}
What's wrong here? Thanks...

Answer 1

while ($row = mysql_fetch_array($result)) {
$product = array();
$product["id"] = $result["id"];
Your results are not in $result, but in $row :
$product["id"] = $row["id"];

Answer 2

I see nothing common with json in your issue :-)
The only problem you have - empty values in array you've created.
You didn't give us any information about table structure you have, and values you are trying to debug.
So just a quick fix to start better debugging could be:
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
$response["registres"][] = $row;
}
but reviewing your code I want to suggest you to stop using deprecated mysql_ calls. Use mysqli or PDO.