<?php $json_object = '[ { "username": "test_username", "character": "TEST", "position": "6", "current_turn": false, "cards": [], "winning_cards": [] }, { "username": "test_username2", "character": "TEST2", "position": "7", "current_turn": false, "cards": [], "winning_cards": [] } ]'; $data = json_decode($json_object,true); foreach($data as $key=>$value) { $data[$key]['winning_cards'] = [1,2,3]; } $json_object = json_encode($data,JSON_PRETTY_PRINT); echo $json_object; ?>
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