ThinkPHP5实现作业管理系统中处理学生未交作业与

//获取学生所在班级的所有作业
 public function getTasks($stuno)
 {
 $stu=$this::get(['stu_no'=>$stuno]);
 $clas=Clas::get(['clas_id'=>$stu['clas_id']]);
 return $clas->task;
 }

//获取某学生所有未交作业
 public function getUnSubmitTasks($stuno)
 {
 $stu=$this::get(['stu_no'=>$stuno]);
 $alltask=$this->getTasks($stuno);
 foreach($alltask as $key=>$value)
 {
  if(Submit::get(['task_id'=>$value['task_id'],'stu_id'=>$stu['stu_id']]))
  {
  unset($alltask[$key]);//删除已提交作业
  }
 }
 return $alltask;
 }

//获取某学生所有已交作业（所有作业和未交作业的差集）
 public function getSubmitTasks($stuno)
 {
 $unsubmit=$this->getUnSubmitTasks($stuno);
 $alltasks=$this->getTasks($stuno);
 $submittasks=array();
 foreach ($alltasks as $key=>$value)
 {
  if(!in_array($value,$unsubmit))
  {
  $submittasks[]=$value;
  }
 }
 return $submittasks;
 }