Online PHP editor | refs for BVFCa

<?php $master_array[] = (array)json_decode('{"results":[{"cat_id":2,"cat_name":"bicycle repairs"}]}', true); $master_array[] = (array)json_decode(null, true); $master_array[] = (array)json_decode('{"results":[{"cat_id":"4","cat_name":"plumber"},{"cat_id":"5","cat_name":"Electrician"},{"cat_id":"6","cat_name":"vet"}]}', true); var_export(array_merge(...array_column($master_array, 'results')));