$ar = array( array( 'sv_id' => 1, 'mid' => 1, 'sv_question1' => 20 ), array( 'sv_id' => 2, 'mid' => 2, 'sv_question1' => 10 ), array( 'sv_id' => 3, 'mid' => 1, 'sv_question1' => 20 ), array( 'sv_id' => 4, 'mid' => 3, 'sv_question1' => 20 ), array( 'sv_id' => 5, 'mid' => 2, 'sv_question1' => 20 ),);$res = array();foreach($ar as $item) { $res[$item['mid']][$item['sv_id']] = $item;}print_r($res);效果如下
Array( [1] => Array ( [1] => Array ( [sv_id] => 1 [mid] => 1 [sv_question1] => 20 ) [3] => Array ( [sv_id] => 3 [mid] => 1 [sv_question1] => 20 ) ) [2] => Array ( [2] => Array ( [sv_id] => 2 [mid] => 2 [sv_question1] => 10 ) [5] => Array ( [sv_id] => 5 [mid] => 2 [sv_question1] => 20 ) ) [3] => Array ( [4] => Array ( [sv_id] => 4 [mid] => 3 [sv_question1] => 20 ) ))转发
详情见
http://bbs.csdn.net/topics/390590251