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<?php $array = [ [ 'data' => [ 'nid' => 1, 'vid' => 1, 'type' => 'article', 'field_new' => [ 'und' => [ [ 'value' => 11111 ] ] ] ] ], [ 'data' => [ 'nid' => 2, 'vid' => 2, 'type' => 'article', 'field_new' => [ 'und' => [ [ 'value' => 33333 ] ] ] ] ] ]; foreach ($array as ['data' => &$data]) { $data['value'] = $data['field_new']['und'][0]['value']; unset($data['field_new']); } var_export($array);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => array ( 'data' => array ( 'nid' => 1, 'vid' => 1, 'type' => 'article', 'value' => 11111, ), ), 1 => array ( 'data' => array ( 'nid' => 2, 'vid' => 2, 'type' => 'article', 'value' => 33333, ), ), )

preferences:
58.58 ms | 402 KiB | 62 Q