<?php $arr1 = [ ['month' => 1], ['month' => 2], ['month' => 3], ['month' => 4] ]; $arr2 = [ ['month' => 3, 'info' => 'Alpha'], ['month' => 4, 'info' => 'Beta'], ['month' => 1, 'info' => 'Gamma'], ]; $arr1 = array_column($arr1, null, 'month'); $arr2 = array_column($arr2, null, 'month'); $result = array_replace($arr1, $arr2); var_dump($result);
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