<?php $str = '{ "1": { "name": "test", "followup": { "1": { "id": "98", "followup": { "1": { "id": "93", "followup": { "1": { "id": "174" } } } } } } } }'; $ids = array(); $data = json_decode($str, true); array_walk_recursive($data, function($v, $k) use (&$ids) { if ($k === 'id') { $ids[] = $v; } }); var_dump($ids);
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