改进异常页面

library/think/App.php

@@ -349,6 +349,12 @@ class App
             self::$debug = Config::get('app_debug');
             if (!self::$debug) {
                 ini_set('display_errors', 'Off');
+            } else {
+                //重新申请一块比较大的buffer
+                if (ob_get_level() > 0) {
+                    ob_end_clean();
+                }
+                ob_start();
             }
 
             // 应用命名空间

library/think/exception/Handle.php

@@ -155,8 +155,10 @@ class Handle
         while (ob_get_level() > 1) {
             ob_end_clean();
         }
+        
+        $data['echo'] = ob_get_clean();
+        
         ob_start();
-        ob_implicit_flush(0);
         extract($data);
         include Config::get('exception_tmpl');
         // 获取并清空缓存