PHP中无法调用控制器

	public function upload(){	$path = "/uploads/news/" . date("ymd");$extarr = array("jpg", "png", "gif");if(isset($_post) and $_server['request_method'] == "post"){    $name = $_files['photoimg']['name'];    $size = $_files['photoimg']['size'];    if(empty($name)){        echo '请选择要上传的图片';        exit;    }// echo "here1";exit();    // echo $name;exit();    $ext = hhhh($name);    echo "here2";exit();    if(!in_array($ext,$extarr)){        echo '图片格式错误！';        exit;    }    if($size>(5*1024*1024)){        echo '图片大小不能超过5m';        exit;    }    $image_name = time().rand(100,999).".".$ext;    $tmp = $_files['photoimg']['tmp_name'];    if(move_uploaded_file($tmp, $path.$image_name)){        echo '<img  src="'.$path.$image_name.'"  class="preview" alt="PHP中无法调用控制器" >';    }else{        echo '上传出错了！';    }    exit;}	}//获取文件类型后缀	// public function indexpublic function hhhh($file_name){ 	echo "here1";exit();    $extend = pathinfo($file_name);    $extend = strtolower($extend["extension"]);    return $extend;}