<?php $array = [ [1, 2, 3], [1, 3], [1, 2, 4, 3], [1, 3, 4] ]; $result = []; foreach ($array as $row) { $count = count($row); $key = $row[0] . '-' . $row[array_key_last($row)]; if (!isset($result[$key]) || $count < $result[$key][0]) { $result[$key] = [$count, $row]; } } var_export(array_column($result, 1));
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