Fetch particular data from duplicated record in PHP - php

Question

I just wanted to know is there a possibility to get specific columns from duplicated row in PHP-MySQL connection and use them to the existing data in JSON?
/...db connection etc.
if ($statement->execute())
{
$response["lecturer"] = array();
while($row = $statement->fetch(PDO::FETCH_ASSOC))
{
$lecturer = array();
$lecturer["id"] = $row["lecturerid"];
$lecturer["image"] = $row["l_image"];
$lecturer["degree"] = $row["degree"];
$lecturer["name"] = $row["l_name"];
$lecturer["surname"] = $row["surname"];
$lecturer["field"] = array();
$lecturer["field"]["fieldid"] = $row["fieldid"];
$lecturer["field"]["name"] = $row["f_name"];
array_push($response["lecturer"], $lecturer);
}
}
/... json_encode etc.
So, there can be a situation, where one lecturer has 2 different fields, and I'm getting something like this:
{
"lecturer": [
{
"id": 1,
"image": "http://...",
"degree": "PhD",
"name": "John",
"surname": "Doe",
"field": {
"fieldid": 13,
"name": "field1"
}
},
{
"id": 1,
"image": "http://...",
"degree": "PhD",
"name": "John",
"surname": "Doe",
"field": {
"fieldid": 14,
"name": "field2"
}
},
Instead of that, I would like to get JSON:
{
"lecturer": [
{
"id": 1,
"image": "http://...",
"degree": "PhD",
"name": "John",
"surname": "Doe",
"field": {
"fieldid": 13,
"name": "field1",
"fieldid": 14,
"name": "field2"
}
},
In the MySQL database there are two tables: lecturer, and field, but also lecturer_field table, where I have relation between lecturerid and fieldid.

Answer 1

As i was pointed out, it's impossible to declare similar named field in json object:
"field": {
"fieldid": 13,
"name": "field1",
"fieldid": 14,
"name": "field2"
}
Valid case is
"field": [{
"fieldid": 13,
"name": "field1",
},
{
"fieldid": 14,
"name": "field2"
}]
You can do that in this way:
if ($statement->execute())
{
$indexedLecturers = array();
while($row = $statement->fetch(PDO::FETCH_ASSOC))
{
$lid = $row["lecturerid"];
if (isset($indexedLecturers[$lid])) {
array_push($indexedLecturers[$lid]["field"], array(
"fieldid" => $row["fieldid"],
"name" => $row["f_name"],
));
} else {
$lecturer = array();
$lecturer["id"] = $lid;
$lecturer["image"] = $row["l_image"];
$lecturer["degree"] = $row["degree"];
$lecturer["name"] = $row["l_name"];
$lecturer["surname"] = $row["surname"];
$lecturer["field"] = array();
array_push($lecturer["field"], array(
"fieldid" => $row["fieldid"],
"name" => $row["f_name"],
));
$indexedLecturers[$lid] = $lecturer;
}
}
$response['lecturer'] = array_values($indexedLecturers);
}