Add json object to json data fetched from database in php - php

Question

In database JSON data is stored in below way:
{"name":"abc","score":5}
Now everytime I want to add json object with different name and score to same json data as :
{"name":"abc","score":5},{"name":"efg","score":8},{"name":"xyz","score":6}
Right now I have tried this code
$database_data = $row['JSONstring']; //fetched json string from database
$json_decode_data = json_decode($database);
array_push($json_decode_data, $new_json_string); //data to append to database data
$updated_json_data = json_encode($json_decode_data); // at last encode the update json data
But this don't work and throws a warning : Parameter 1 is an object.
How do solve it ?

Answer 1

Now with all the answer and comments given here I got the required answer. So I appreciate all your help.
In my question starting, the first JSON String format is invalid:
{"name":"abc","score":5}
Instead of this, it would be :
[{"name":"abc","score":5}]
Required JSON data's format would be:
[{"name":"abc","score":5},{"name":"efg","score":8},{"name":"xyz","score":6}]
And this is achieved by array_merge() function as follows:
Code to append json object to json object string
//fetched json string from database
ie.[{"name":"abc","score":5}]
$database_data = $row['JSONstring'];
//decode both string the database data string and the new one which is to be merged
$json_decode_database_data = json_decode($database_data, true);
$json_decode_new_data = json_decode($database_data, true);
//merge both the decoded array by array_merge()
$required_json_data = array_merge($json_decode_data, $new_json_string);
//at last encode required json data
$updated_json_data = json_encode($required_json_data);
// You will get required json data
[{"name":"abc","score":5},{"name":"efg","score":8},{"name":"xyz","score":6}]