PHP upload class (secure upload class)

<?php
//php文件上传类

header("Content-Type:text/html; charset=utf-8");
date_default_timezone_set("Asia/Shanghai");

class UploadFile
{
    private $imageType = [
        "image/gif",
        "image/jpeg",
        "image/jpg",
        "image/png",
        "image/x-png",
        "image/bmp",
        "image/x-ms-bmp",
        "image/pjpeg",
    ]; //image type
    private $fileType = [
        "application/zip",
        "application/msexcel",
        "application/xml",
        "application/vnd.ms-excel",
        "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
        "application/mspowerpoint",
        "application/vnd.ms-powerpoint",
        "application/pdf",
        "application/x-shockwave-flash",
        "application/x-rar-compressed",
        "application/x-rar",
        "audio/mpeg",
        "audio/x-ms-wma",
        "flv-application/octet-stream",
        "audio/x-ms-wmv",
        "video/mp4",
        "video/x-flv",
        "audio/x-wav",
        "application/msword",
        "video/mpeg",
    ]; //file type
    private $tmpName;
    private $fileName;
    private $error;
    private $fileSize; //upload file size
    private $maxSize = 10000000; //Maximum allowable upload size
    private $upName;
    private $upDir = "uploadfile/"; //upload file dir

    //The constructor defaults to image upload
    function __construct($upType = "image")
    {
        $this->tmpName = $_FILES["file"]["tmp_name"];
        $this->fileName = $_FILES["file"]["name"];
        $this->error = $_FILES["file"]["error"];
        $this->fileSize = $_FILES["file"]["size"];
        $this->upName = date("Y") . date("m") . date("d") . uniqid(); //Generate random file names
        //Determine the file size
        if ($this->fileSize > $this->maxSize) {
            exit("File exceeding" . $this->maxSize / 1024 / 1024 . " M ");
        }
        if ($this->error > 0) {
            exit($error);
        } //Determines that the upload is wrong
        if ($upType == "image") {
            $this->checkImage();
        } else {
            $this->checkFile();
        }
        $this->uploadFile();
    }

    //Detect the image type
    function checkImage()
    {
        $ftype = getimagesize($this->tmpName);
        if (!in_array($ftype["mime"], $this->imageType)) {
            exit("Illegal image type");
        }
    }

    //Detect file types
    function checkFile()
    {
        $finfo = finfo_open(FILEINFO_MIME_TYPE);
        $ftype = finfo_file($finfo, $this->tmpName); //The file type is judged based on the file content
        finfo_close($finfo);
        if (!in_array($ftype, $this->fileType)) {
            exit("Illegal file types");
        }
    }

    //Get the file extension
    function getExtension($fileext)
    {
        return pathinfo($fileext, PATHINFO_EXTENSION);
    }

    //Upload the file
    function uploadFile()
    {
        if (!is_uploaded_file($this->tmpName)) {
            exit("Illegal uploads");
        } else {
            move_uploaded_file(
                $this->tmpName,
                $this->upDir .
                    $this->upName .
                    "." .
                    $this->getExtension($this->fileName),
            );
            echo "Upload as: " .
                $this->upDir .
                $this->upName .
                "." .
                $this->getExtension($this->fileName);
        }
    }
}
$up = new UploadFile(); //Upload an image
//$up=new UploadFile("file");//Upload   file
?>