教师端，显示修改

application/api/controller/coach/Lesson.php

@@ -184,7 +184,7 @@ class Lesson extends Apic
             ->select();
         $pay_number = list_domain_image($pay_number,['avatar']);
         foreach($pay_number as $key => $val){
-            $pay_number[$key]['showname'] = $val['firstname'].$val['lastname'];
+            $pay_number[$key]['showname'] = $val['firstname'].' '.$val['lastname'];
         }
 
         $info['usernumber'] = array_sum(array_column($pay_number,'usernumber'));