<?php $array1 = [ [10, 'Some Name..'], [11, 'Some Name..'], [13, 'Some Name..'], ]; $array2 = [ [13, 'Viewed'] ]; var_export( array_reduce( array_merge($array1, $array2), function($result, $row) { if (!isset($result[$row[0]])) { $result[$row[0]] = $row; } else { $result[$row[0]][] = $row[1]; } return $result; } ) );
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