• Based on query data using Eloquent in Laravel models or retrieving data from RESTful APIs, we have the following JSON string:

$jsonString = [{"instruction_id":131},{"instruction_id":132},{"instruction_id":133},{"instruction_id":134}];

• In PHP function, we have solution to convert JSON data into PHP arrays or objects.

json_decode($jsonString, true)

For example:

$jsonString = [{"instruction_id":131},{"instruction_id":132},{"instruction_id":133},{"instruction_id":134}];

$instruction_ids = array_map(function($item) {
    return $item['instruction_id'];
}, json_decode($jsonString, true));

$jsonStringWithComma = implode(',', $instruction_ids);