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<?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; } ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 1 => array ( 0 => array ( 0 => 'a', 1 => 1, ), 1 => array ( 0 => 'b', 1 => 1, ), ), 2 => array ( 0 => array ( 0 => 'c', 1 => 2, ), 1 => array ( 0 => 'd', 1 => 2, ), ), ) --- array ( 1 => array ( 0 => array ( 0 => 'a', 1 => 1, ), 1 => array ( 0 => 'b', 1 => 1, ), ), 2 => array ( 0 => array ( 0 => 'c', 1 => 2, ), 1 => array ( 0 => 'd', 1 => 2, ), ), )

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