Convert to JSON array which contain data in 3 tables - php

Question

Hi am new to this topic and I really need a help from you who really know about this.
Below image shows my db design and query with results.
Following code is that I've tried so far.
<?php
include_once './DbConnect.php';
$db = new DbConnect();
$response = array();
$response["content_info"] = array();
$query = "SELECT Aid, AName, Bid, BName, Cid, CName, Content FROM A, B, C WHERE fk_Aid = Aid AND fk_Bid = Bid";
$result = mysqli_query($db->getConnection(),$query);
while($row = mysqli_fetch_array($result)){
$tmp = array();
$tmp["Aid"] = $row["Aid"];
$tmp["AName"] = $row["AName"];
$tmp["Bid"] = $row["Bid"];
$tmp["BName"] = $row["BName"];
$tmp["Cid"] = $row["Cid"];
$tmp["CName"] = $row["CName"];
$tmp["Content"] = $row["Content"];
// push info to final json array
array_push($response["content_info"], $tmp);
}
header('Content-Type: application/json');
echo json_encode($response);
?>
But it returns following JSON Object:
{
"content_info": [
{
"Aid": "A1",
"AName": "AName1",
"Bid": "B1",
"BName": "BName1",
"Cid": "C1",
"CName": "CName1",
"Content": "aaaaaaa"
},
{
"Aid": "A1",
"AName": "AName1",
"Bid": "B1",
"BName": "BName1",
"Cid": "C2",
"CName": "CName2",
"Content": "abdsdsfdsf"
},
{
"Aid": "A1",
"AName": "AName1",
"Bid": "B2",
"BName": "BName2",
"Cid": "C3",
"CName": "CName3",
"Content": "dfefeeefeee"
},
{
"Aid": "A1",
"AName": "AName1",
"Bid": "B2",
"BName": "BName2",
"Cid": "C4",
"CName": "CName4",
"Content": "fdsfdfdsf"
},
{
"Aid": "A2",
"AName": "AName2",
"Bid": "B3",
"BName": "BName3",
"Cid": "C5",
"CName": "CName5",
"Content": "fsdfsfsfddf"
}
]
}
But This is not the JSON object that I am expected. Following structure is the that I wanted
{
"content_info": [
{
"Aid": "A1",
"AName": "AName1",
"B": [
{
"Bid": "B1",
"BName": "BName1",
"C": [
{
"Cid": "C1",
"CName": "CName1",
"Content": "aaaaaaa"
},
{
"Cid": "C2",
"CName": "CName2",
"Content": "abdsdsfdsf"
}
]
},
{
"Bid": "B2",
"BName": "BName2",
"C": [
{
"Cid": "C3",
"CName": "CName3",
"Content": "dfefeeefeee"
},
{
"Cid": "C4",
"CName": "CName4",
"Content": "fdsfdfdsf"
}
]
}
]
},
{
"Aid": "A2",
"AName": "AName2",
"B": [
{
"Bid": "B3",
"BName": "BName3",
"C": [
{
"Cid": "C5",
"CName": "CName5",
"Content": "fsdfsfsfddf"
}
]
}
]
Please If someone knows could you please tell me what should I need to edit.
Thank You anyone who try for this.

Answer 1

while($row = mysqli_fetch_array($result)){
$tmp = array();
$tmp["Aid"] = $row["Aid"];
$tmp["AName"] = $row["AName"];
$tmp["B"] = array();
$query1 = "select * from B where fk_Aid= ".$row["Aid"];
$result1 = mysqli_query($db->getConnection(),$query1);
if($result1){
while($row1 = mysqli_fetch_array($result1)){
$tmp1 = array();
$tmp1["Bid"] = $row1["Bid"];
$tmp1["BName"] = $row1["BName"];
$tmp1["C"] = array();
$query2 = "select * from C where fk_Bid = ".$row1["Bid"];
$result2 = mysqli_query($db->getConnection(),$query2);
if($result2){
while($row2 = mysqli_fetch_array($result2)){
$tmp2 = array();
$tmp2["Cid"] = $row2["Cid"];
$tmp2["CName"] = $row2["CName"];
$tmp2["Content"] = $row2["Content"];
array_push($tmp1["C"], $tmp2);
}
}
array_push($tmp["B"], $tmp1);
}
}
array_push($response["content_info"], $tmp);
}

Answer 2

Set this to echo json_encode($response,true) for an associative array