关于简化代码。求大神指导

if(empty($grouptypeid)){		ShowMsg('请指定所属考试！', '-1');        exit();	}if(empty($content)){	    ShowMsg('内容不能为空！','-1');		exit();	}if(empty($teachername)){	    ShowMsg('请选择教师!','-1');		exit();	}if(empty($years)){	    ShowMsg('请选择日期','-1');		exit();	}if(empty($isupdate)){	    ShowMsg('请选择更新日期','-1');		exit();	}

$dict = array(  'grouptypeid' => '请指定所属考试！',  'content' => '内容不能为空！',  'teachername' => '请选择教师!',  'years' => '请选择日期',  'isupdate' => '请选择更新日期',);foreach($_POST as $k=>$v) {  if(empty($v)) {    ShowMsg($dict[$k], '-1');    exit;  }  $$k = $v;}