推荐信息的范围内随机不重复处理

application/controllers/information.php

@@ -1142,8 +1142,10 @@ class Information extends CI_Controller
         }
         //读取备用节点
         if (empty($data) && !empty($recommand->ir_urls)) {//查不到信息并且备选urls不为空，则随机选一条
+//            $url_array = explode("\n", $recommand->ir_urls);
+//            $data = $this->Information_model->Detail(trim($url_array[rand(0, count($url_array) - 1)]));
             $url_array = explode("\n", $recommand->ir_urls);
-            $data = $this->Information_model->Detail(trim($url_array[rand(0, count($url_array) - 1)]));
+            $data = $this->Information_model->random_range(1,$url_array, $exclude_ids);
         }
         if (!empty($data)) {
             $exclude_ids[] = $data->is_id;
@@ -1183,7 +1185,7 @@ class Information extends CI_Controller
             }
         }
         //print_r($data);
-		log_message('error',  'exclude_ids: '.$information->ic_url.' '.implode(',',$exclude_ids));
+		//log_message('error',  'exclude_ids: '.$information->ic_url.' '.implode(',',$exclude_ids));
         return $data;
     }
 

application/models/information_model.php

@@ -105,6 +105,21 @@ class Information_model extends CI_Model {
         return $this->GetList();
     }
 
+    //在urls列表里面，随机获取N条数据，并且排除某些id
+    function random_range($topnum,array $url_array,array $exclude_ids){
+        $this->init();
+        $this->topNum = $topnum;
+        $this->search =' AND ( 1=2 ';
+        foreach ($url_array as $item){
+            $this->search .= ' OR ic_url= '.$this->HT->escape(trim($item));
+        }
+        $this->search .=' )';
+        $exclude_ids_string=implode(',',$exclude_ids);
+        $this->search .= " AND ic_status=1  AND is_id NOT in ($exclude_ids_string,0)";
+        $this->orderBy = " ORDER BY  NewID()  ";
+        return $this->GetList();
+    }
+
     //根据url搜索信息
     function search_url($url) {
         $this->init();