Create nested json object using php mysql

Question

I have two tables, table 1 has 2 fields (question_pk, question_name) and table 2 has 4 fields(ans_pk, options, question_fk and right_answer). I want to create json l

Answer 1

I think this code is easier to figure out and by the way it uses mysqli ...

This is based on my own data structure, I am in the middle of something and I have no time a.t.m. to adapt it to the question but should easy to figure out how to adapt it to other structures :

$usersList_array =array();
$user_array = array();
$note_array = array();

$fetch_users = mysqli_query($mysqli, "SELECT 
        ID, 
        Surname, 
        Name 
    FROM tb_Users 
    WHERE Name LIKE 'G%' 
    ORDER BY ID") or die(mysqli_error($mysqli));
while ($row_users = mysqli_fetch_assoc($fetch_users)) {
    $user_array['id'] = $row_users['ID'];
    $user_array['surnameName'] = $row_users['Surname'].' '.$row_users['Name'];
    $user_array['notes'] = array();

    $fetch_notes = mysqli_query($mysqli, "SELECT 
        id, 
        dateIns, 
        type, 
        content 
     FROM tb_Notes 
     WHERE fk_RefTable = 'tb_Users' AND 
         fk_RefID = ".$row_users['ID'].""
   ) or die(mysqli_error($mysqli));
    while ($row_notes = mysqli_fetch_assoc($fetch_notes)) {
        $note_array['id']=$row_notes['id'];
        $note_array['dateIns']=$row_notes['dateIns'];
        $note_array['type']=$row_notes['type'];
        $note_array['content']=$row_notes['content'];
        array_push($user_array['notes'],$note_array);
    }

    array_push($usersList_array,$user_array);
}

$jsonData = json_encode($usersList_array, JSON_PRETTY_PRINT);


echo $jsonData; 

Resulting JSON :

[
{
    "id": "1",
    "surnameName": "Xyz Giorgio",
    "notes": [
        {
            "id": "1",
            "dateIns": "2016-05-01 03:10:45",
            "type": "warning",
            "content": "warning test"
        },
        {
            "id": "2",
            "dateIns": "2016-05-18 20:51:32",
            "type": "error",
            "content": "error test"
        },
        {
            "id": "3",
            "dateIns": "2016-05-18 20:53:00",
            "type": "info",
            "content": "info test"
        }
    ]
},
{
    "id": "2",
    "cognomeNome": "Xyz Georg",
    "notes": [
        {
            "id": "4",
            "dateIns": "2016-05-20 14:38:20",
            "type": "warning",
            "content": "georg warning"
        },
        {
            "id": "5",
            "dateIns": "2016-05-20 14:38:20",
            "type": "info",
            "content": "georg info"
        }
    ]
}
]

Answer 2

Hi try this,

<?php
include '../config/config.php';
if(isset($_GET['sub_cat_id']))
{
    $sub_cat_id = $_GET['sub_cat_id']; 
    $result = mysql_query("SELECT * FROM $questions WHERE sub_cat='$sub_cat_id' ORDER BY level_fk ASC"); 
    $json_response = array(); //Create an array
    while ($row = mysql_fetch_array($result))
    {
        $row_array = array();
        $row_array['qus_pk'] = $row['qus_pk'];        
        $row_array['question'] = $row['question'];
        $row_array['answers'] = array();
        $qus_pk = $row['qus_pk'];  

        $option_qry = mysql_query("SELECT * FROM $qus_ans WHERE qus_pk=$qus_pk");
        while ($opt_fet = mysql_fetch_array($option_qry))
        {
            $row_array['answers'][] = array(
                'options' => $opt_fet['options'],
                'right_ans' => $opt_fet['right_ans'],
            );

        }
        array_push($json_response, $row_array); //push the values in the array
    }
    echo json_encode($json_response);
}
?>