How to properly format data as JSON - php

Question

I am working on hotels API, which needs to send data in JSON form,
But my JSON form is wrong and the API is not working.
My code is:-
$json = json_encode([
'RoomGuests' => [ json_encode(["NoOfAdults"=> 1,"NoOfChild"=> 0,"ChildAge"=> null])],
]);
And my output is :-
{
"RoomGuests": [
"{\"NoOfAdults\":1,\"NoOfChild\":0,\"ChildAge\":null}"
] }
And I want the result like this:-
{
"RoomGuests": [{
"NoOfAdults": 1,
"NoOfChild": 0,
"ChildAge": null
}], }
Please let me know how to solve this issue.

Answer 1

Use this
$json = json_encode([
'RoomGuests' => [["NoOfAdults"=> 1,"NoOfChild"=> 0,"ChildAge"=> null]],
]);
echo $json;
This will results into
{
"RoomGuests": [
{
"NoOfAdults": 1,
"NoOfChild": 0,
"ChildAge": null
}
]
}

Answer 2

For correct output instead of:
$json = json_encode([
'RoomGuests' => [ json_encode(["NoOfAdults"=> 1,"NoOfChild"=> 0,"ChildAge"=> null])],
]);
enough to make:
$json = json_encode([
'RoomGuests' => [ ["NoOfAdults"=> 1,"NoOfChild"=> 0,"ChildAge"=> null] ],
]);
json_encode will recursively encode all sub arrays. So it is enough to call only once.

Answer 3

This is my code which print the output in json format.You can edit it as per yours:
<?php
include_once('connect.php');
{
error_reporting( error_reporting() & ~E_NOTICE );
$id = $_GET['id'];
$name = $_GET['name'];
$date = $_GET['date'];
$select = "select * from details";
$sel = "select id,name from details";
$res = mysqli_query($con, $select);
$result = mysqli_query($con,$sel);
while($row = mysqli_fetch_object($res))
{
$output[] = $row;
}
if(empty($output))
{
print(json_encode("User doesn't exist"));
}
else{
while($col = mysqli_fetch_object($result))
{
$output[] = $col;
}
if(empty($output))
{
print(json_encode("User doesn't exits"));
}
else{
print(json_encode($output));
}
}
}
?>

Answer 4

<?php
$a = (object)[
'RoomGuests' => [
(object)["NoOfAdults"=> 1,"NoOfChild"=> 0,"ChildAge"=> null]
],
];
var_export(json_encode($a));
Result:
{"RoomGuests":[{"NoOfAdults":1,"NoOfChild":0,"ChildAge":null}]}