php web service cannot read my angular js key value - php

Question

I am using angularjs 1.6.4 version, I send my keys and values to php web service but my key and value does not read, I get result for in database stored at '0', this is my angular js code,
$scope.fav = {
"userid":101,
"favid":120
}
$http({
method:"POST",
url:apiurl+"addFavorites.php",
data:JSON.stringify($scope.fav)
}).then(function(data)
{
$scope.favorites = data.data;
alert(data.data.message);
});
this is my php rest api
include("../includes/db.php");
//creating response array
$response = array();
$request_method = $_SERVER['REQUEST_METHOD'];
if ($request_method == 'POST' && array_key_exists('HTTP_X_HTTP_METHOD', $_SERVER)) {
if ($_SERVER['HTTP_X_HTTP_METHOD'] == 'DELETE') {
$request_method = 'DELETE';
} else if ($_SERVER['HTTP_X_HTTP_METHOD'] == 'PUT') {
$request_method = 'PUT';
} else {
throw new Exception("Unexpected Header");
}
}
if($request_method == "POST"){
//getting values
$userid = isset($_POST['userid']) && $_POST['userid'] != '' ? trim($_POST['userid']) : "";
$favid = isset($_POST['favid']) && $_POST['favid'] != '' ? trim($_POST['favid']) : "";
if ($favid == 0) {
$strupdate = mysql_query("insert into nr_favourites(UserProfileId,FavouriteUserProfileId,CreatedDate)Values('$userid','$favid',now())");
}
if ($favid != 0) {
$sql = mysql_query("select * from nr_favourites where id=$favid");
$rc = mysql_num_rows($sql);
if ($rc != 0) {
$strupdate = mysql_query("insert into nr_favourites(UserProfileId,FavouriteUserProfileId,CreatedDate)Values('$userid','$favid',now())");
}
}
if ($strupdate)
{
$response['error']=false;
$response['message']='add favourites successfully!';
}
else
{
$response['error']=true;
$response['message']='add favourites not successfully.';
}
} else {
$response['error']=true;
$response['message']='You are not authorized';
}
header('Content-Type: application/json');
echo json_encode($response);
those are my code, please help me to solve this error

Answer 1

It looks like you may be saving strings to numerical fields. When JSON.stringify($scope.fav) is called the numbers are converted to strings.
Here
$userid = isset($_POST['userid']) && $_POST['userid'] != '' ? trim($_POST['userid']) : "";
$favid = isset($_POST['favid']) && $_POST['favid'] != '' ? trim($_POST['favid']) : "";
since user_id and favid are strings they are set to empty strings every time. My guess would be both
nr_favourites.UserProfileId
nr_favourites.FavouriteUserProfileId
are numerical fields which are receiving strings hence the 0 values. Remove JSON.stringify() and save nulls rather than empty strings, this should take care of the issue.