PHP OOP处理UI的错误通知

我正在寻找为用户显示错误的最佳方法，我正在使用类文件()和配置文件页面。类File()将处理以下事项:-检查文件扩展名-检查文件是否已经存在-爆炸并创建链接文件&&插入到数据库的链接-上传文件到项目文件夹

代码正常工作，除了错误显示，例如，如果扩展名错误，它将显示最后一个错误，而不是停止执行并显示扩展名错误。

如果文件已经存在于数据库&&文件夹目录下的php函数move_uploaded_file将显示错误"Warning: failed to open stream: permission denied"

谢谢你的帮助

    class File {
    private $file = array();
    private $file_up = '';
    private $pdo = '';
    private $error = '';
    private $regex_file = '/^[a-z0-9][a-z0-9]{4,20}.jpg|.jpeg|.png|.gif|.txt|.doc|.docx|.pdf|.xlsx|.xlm|.xls|.pub|.one|.pptx$i/';
    /**
     * [__construct connection ]
     * @param [int] $id [Unique user_id retrieved from database (from include/header.inc)]
     * Construct database connection using PDO
     * 
     */
    public function __construct($id)
    {
        $this->pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME, DB_USER, DB_PASS, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
        $sql = 'SELECT `file_name`, `file_extention` FROM `users`'
                 .'JOIN `file`'
                 .'ON users.`user_id` = file.`user_id`'
                 .'WHERE users.`user_id` = :id';
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute(array(':id' => $id));
        while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
            $this->file[] = $row['file_name'] . '.' . $row['file_extention'];
        }
    }
    /**
     * [displayFile extention]
     * @return [link] [description]
     */
    public function displayFile() 
    {
        $output = '';
        $link = $this->file;
        foreach($link as $row) {
            $output .= '<table class="table table-bordered table-hover"';
            $output .= '<thead><tr>';
            $output .= '<th><a href="../file_user/'.$row.'><i class="fa fa-folder"></i>&nbsp&nbsp'.$row.'</a><br /></th>';
            $output .= '</tr></thead>';
            $output .= '</table>';
        }
        return $output;
    }
    public function checkFile($file)
    {
        $this->file_up = strip_tags($file);
        if(!preg_match($this->regex_file, $this->file_up)){
                $this->error = '<b style="color:red">Extention ou nom de fichier incorrect</b>';
        }
        foreach($this->file as $row){
            if($this->file_up == $row){
                $this->error = '<b style="color:red">Fichier ou nom du fichier deja existant</b>';
            }
        }
        if($this->error){
            return $this->error;
        }else{
            $this->file_up = explode(".", $this->file_up);// array
            return $this->file_up;
        }       
    }
    public function getError()
    {
        if($this->error !== ''){
            return $this->error;
        }
    }
    public function uploadFile($array, $id)
    {   
        if(is_array($array)){
            array_push($array, $id);
            $sql = 'INSERT INTO `file`(`file_name`, `file_extention`, `user_id`) VALUES (?, ?, ?)';
            $con = $this->pdo->prepare($sql);
            $con->execute($array);
        }else{
            $this->error = '<b style="color:red">Fichier ne peut etre telecharger</b>';
        }
    }
    public function mvFile($size, $name, $tmp_name)
    {
        $to = 'file_user/';
        if($size <= 2000000){
            move_uploaded_file($tmp_name, $to.$name);
            $this->error = '<b style="color:green">Fichier téléchargé avec succes</b>';
        }else{
            $this->error = '<b style="color:red">Un probleme est survenue veuillez recommencer</b>';
        }
    }
}

和testing.php来测试它:

require_once 'class/file.inc';
$error = '';
$id = 2;
$file = new File($id);
 $name = $_FILES['file']['name'];
 $size = $_FILES['file']['size'];
 $type = $_FILES['file']['type'];
 $tmp_name = $_FILES['file']['tmp_name'];

if(isset($_FILES['file'])){
        $file_up = $_FILES['file']['name'];
        $file_up = $file->checkFile($file_up);
        $file->uploadFile($file_up, $id);
        //$file->mvFile($size, $name, $_FILES['file']['tmp_name']);
    if($file->getError()){
        $error = $file->getError();
    }
} // end isset
if($error){
    echo $error;
}