php排除有某同一特徵的資料

想用foreach來擷取gid， 得到以下的資料：gid 相同，
有什麼辦法排除同樣的gid，一樣的gid,只留一組.

[  {    "id": "151",    "uid": "101497",    "gid": "399",    "create_time": "1462445116",    "msg": null,    "number": "148",    "order_id": "2016050518451705537",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462445416",    "status": "1"  },  {    "id": "132",    "uid": "101497",    "gid": "399",    "create_time": "1462420981",    "msg": null,    "number": "97",    "order_id": "2016050512030120339",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462421281",    "status": "1"  },  {    "id": "133",    "uid": "101497",    "gid": "399",    "create_time": "1462426436",    "msg": null,    "number": "97",    "order_id": "2016050513335645342",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462426736",    "status": "1"  }]

回複內容：

想用foreach來擷取gid， 得到以下的資料：gid 相同，
有什麼辦法排除同樣的gid，一樣的gid,只留一組.

[  {    "id": "151",    "uid": "101497",    "gid": "399",    "create_time": "1462445116",    "msg": null,    "number": "148",    "order_id": "2016050518451705537",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462445416",    "status": "1"  },  {    "id": "132",    "uid": "101497",    "gid": "399",    "create_time": "1462420981",    "msg": null,    "number": "97",    "order_id": "2016050512030120339",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462421281",    "status": "1"  },  {    "id": "133",    "uid": "101497",    "gid": "399",    "create_time": "1462426436",    "msg": null,    "number": "97",    "order_id": "2016050513335645342",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462426736",    "status": "1"  }]

$str='[  {    "id": "151",    "uid": "101497",    "gid": "399",    "create_time": "1462445116",    "msg": null,    "number": "148",    "order_id": "2016050518451705537",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462445416",    "status": "1"  },  {    "id": "132",    "uid": "101497",    "gid": "399",    "create_time": "1462420981",    "msg": null,    "number": "97",    "order_id": "2016050512030120339",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462421281",    "status": "1"  },  {    "id": "133",    "uid": "101497",    "gid": "398",    "create_time": "1462426436",    "msg": null,    "number": "97",    "order_id": "2016050513335645342",    "type": "0",    "prepay_id": null,    "code": null,    "recharge": "0",    "wid": "0",    "end_time": "1462426736",    "status": "1"  }]';$arr = json_decode($str,1);$res = [];foreach($arr as $v){      if (!isset($res[$v['gid']])){           $res[$v['gid']] = $v;      }}echo '
';print_r(array_values($res));
                                        
                                    
自己寫個函數去除重複的數據在遍歷啊
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