<?php $json = '[{"_id":"123","books":[{"author":"John","title":"The Book"},{"author":"Smith","title":"Something!"}]},{"_id":"321","books":[{"author":"John","title":"The Book"}]}]'; $array = json_decode($json, 1); $ids = []; foreach($array as $v) { foreach($v['books'] as $book){ $books[] = $book; } } print_r($books); echo json_encode($books); ?>
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