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Сортировка многомерных массивов по ключу на PHP #

$data=array(
        array('text'=>'str1', 'year'=>'2010', 'author'=>10),
        array('text'=>'str2', 'year'=>'2011', 'author'=>10),
        array('text'=>'str3', 'year'=>'2009', 'author'=>20),
        array('text'=>'str4', 'year'=>'2010', 'author'=>30),
        array('text'=>'str5', 'year'=>'2010', 'author'=>20),
        array('text'=>'str6', 'year'=>'2011', 'author'=>10),
        array('text'=>'str7', 'year'=>'2011', 'author'=>20),
        array('text'=>'str8', 'year'=>'2009', 'author'=>20),
);

$data_author=array();
foreach($data as $key=>$arr){
        $data_author[$key]=$arr['author'];
}
 
$data_year=array();
foreach($data as $key=>$arr){
        $data_year[$key]=$arr['year'];
}
 
array_multisort($data_year, SORT_NUMERIC, $data_author, $data);
var_export($data);

array(
  0 => array('text' => 'str3', 'year' => '2009', 'author' => 20, ),
  1 => array('text' => 'str8', 'year' => '2009', 'author' => 20, ),
  2 => array('text' => 'str1', 'year' => '2010', 'author' => 10, ),
  3 => array('text' => 'str5', 'year' => '2010', 'author' => 20, ),
  4 => array('text' => 'str4', 'year' => '2010', 'author' => 30, ),
  5 => array('text' => 'str2', 'year' => '2011', 'author' => 10, ),
  6 => array('text' => 'str6', 'year' => '2011', 'author' => 10, ),
  7 => array('text' => 'str7', 'year' => '2011', 'author' => 20, ),
);