public function verifyImg(){
ob_end_clean(); //增加这句
$Verify = new \Think\Verify();
$Verify->fontSize = 16;
$Verify->length = 1;
$Verify->imageW =100;
$Verify->imageH =25;
$Verify->useNoise = false;
$Verify->entry();
}
原文：http://www.cnblogs.com/8000cabbage/p/6253929.html