根据键值取出重复的数据

处理前的数据 $list_config
array(12) {  [0] => array(4) {    ["car_id"] => string(2) "56"    ["type_name"] => string(34) "奥迪Q5 2013款 40 TFSI 技术型"    ["brand"] => string(6) "奥迪"    ["series"] => string(8) "奥迪Q5"  }  [1] => array(4) {    ["car_id"] => string(2) "61"    ["type_name"] => string(26) "宝马X6 2011款 xDrive35i"    ["brand"] => string(6) "宝马"    ["series"] => string(8) "宝马X6"  }  [2] => array(4) {    ["car_id"] => string(2) "63"    ["type_name"] => string(35) "宝马X5 2009款 xDrive30i豪华型"    ["brand"] => string(6) "宝马"    ["series"] => string(8) "宝马X5"  }  [3] => array(4) {    ["car_id"] => string(2) "54"    ["type_name"] => string(38) "奔驰C级 2011款 C 200 CGI 时尚型"    ["brand"] => string(6) "奔驰"    ["series"] => string(10) "奔驰C级"  }  [4] => array(4) {    ["car_id"] => string(2) "65"    ["type_name"] => string(33) "宝马3系 2009款 320i 时尚型"    ["brand"] => string(6) "宝马"    ["series"] => string(10) "宝马3系"  }  [5] => array(4) {    ["car_id"] => string(2) "62"    ["type_name"] => string(32) "奥迪A6L 2010款 2.4L 舒适型"    ["brand"] => string(6) "奥迪"    ["series"] => string(9) "奥迪A6L"  }  [6] => array(4) {    ["car_id"] => string(2) "71"    ["type_name"] => string(41) "奥迪A4L 2013款 35 TFSI 自动标准型"    ["brand"] => string(6) "奥迪"    ["series"] => string(9) "奥迪A4L"  }  [7] => array(4) {    ["car_id"] => string(2) "49"    ["type_name"] => string(42) "奥迪A5 2012款 3.0TFSI Sportback quattro"    ["brand"] => string(6) "奥迪"    ["series"] => string(8) "奥迪A5"  }  [8] => array(4) {    ["car_id"] => string(3) "405"    ["type_name"] => string(44) "速腾 2014款 改款 1.4TSI 手动豪华型"    ["brand"] => string(6) "大众"    ["series"] => string(6) "速腾"  }  [9] => array(4) {    ["car_id"] => string(3) "421"    ["type_name"] => string(45) "标致307 2010款 三厢 1.6L 手动舒适版"    ["brand"] => string(6) "标致"    ["series"] => string(9) "标致307"  }  [10] => array(4) {    ["car_id"] => string(3) "404"    ["type_name"] => string(28) "科鲁兹 2012款 1.6L SE MT"    ["brand"] => string(9) "雪佛兰"    ["series"] => string(9) "科鲁兹"  }  [11] => array(4) {    ["car_id"] => string(3) "416"    ["type_name"] => string(32) "歌诗图 2011款 3.5L 旗舰版"    ["brand"] => string(6) "本田"    ["series"] => string(9) "歌诗图"  }}



处理程序： 


foreach($list_config as $k => $v){
                    if(!($brr[$v['brand']])){
                        $brr[$v['brand']] = $v;
                    }
                }
             $brandlist=array_values($brr);





处理后的数据 $brandlist

array(7) {  [0] => array(4) {    ["car_id"] => string(2) "56"    ["type_name"] => string(34) "奥迪Q5 2013款 40 TFSI 技术型"    ["brand"] => string(6) "奥迪"    ["series"] => string(8) "奥迪Q5"  }  [1] => array(4) {    ["car_id"] => string(2) "61"    ["type_name"] => string(26) "宝马X6 2011款 xDrive35i"    ["brand"] => string(6) "宝马"    ["series"] => string(8) "宝马X6"  }  [2] => array(4) {    ["car_id"] => string(2) "54"    ["type_name"] => string(38) "奔驰C级 2011款 C 200 CGI 时尚型"    ["brand"] => string(6) "奔驰"    ["series"] => string(10) "奔驰C级"  }  [3] => array(4) {    ["car_id"] => string(3) "405"    ["type_name"] => string(44) "速腾 2014款 改款 1.4TSI 手动豪华型"    ["brand"] => string(6) "大众"    ["series"] => string(6) "速腾"  }  [4] => array(4) {    ["car_id"] => string(3) "421"    ["type_name"] => string(45) "标致307 2010款 三厢 1.6L 手动舒适版"    ["brand"] => string(6) "标致"    ["series"] => string(9) "标致307"  }  [5] => array(4) {    ["car_id"] => string(3) "404"    ["type_name"] => string(28) "科鲁兹 2012款 1.6L SE MT"    ["brand"] => string(9) "雪佛兰"    ["series"] => string(9) "科鲁兹"  }  [6] => array(4) {    ["car_id"] => string(3) "416"    ["type_name"] => string(32) "歌诗图 2011款 3.5L 旗舰版"    ["brand"] => string(6) "本田"    ["series"] => string(9) "歌诗图"  }}