<?php $ar = [ 0 => ['details' => '{"E":{"id": 3}}'], 1 => ['details' => '{"V":{"id": 8}}'], 2 => ['details' => '{"F":{"id": 5}}'], 3 => ['details' => '{"D":{"id": 1}}'], ]; $ar = array_map(function ($value) { return array_values(json_decode($value['details'], true))[0]['id']; }, $ar); print_r($ar);
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