<?php $array = [ [ ['color' => 'RED'], ['color' => 'BLUE'], ['color' => 'GREEN'] ], [ ['color' => 'RED'], ['color' => 'PURPLE'], ['color' => 'RED'] ] ]; $result = []; foreach ($array as $row) { $result[] = array_values(array_column($row, null, 'color')); } echo json_encode($result);
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