<?php $array = [['a', 1], ['b', 1], ['c',2], ['d',2]]; $result = []; foreach ($array as $row) { $result[$row[1]][] = $row; } var_export($result); echo "\n---\n"; var_export( array_reduce( $array, function ($carry, $row) { $carry[$row[1]][] = $row; return $carry; } ) );
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