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<?
$phpFileUploadErrors = array(
  0 => 'There is no error, the file uploaded with success',
  1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
  2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
  3 => 'The uploaded file was only partially uploaded',
  4 => 'No file was uploaded',
  6 => 'Missing a temporary folder',
  7 => 'Failed to write file to disk.',
  8 => 'A PHP extension stopped the file upload.',
);

<?php

class UploadException extends Exception 
{ 
    public function __construct($code) { 
        $message = $this->codeToMessage($code); 
        parent::__construct($message, $code); 
    } 

    private function codeToMessage($code) 
    { 
        switch ($code) { 
            case UPLOAD_ERR_INI_SIZE: 
                $message = "The uploaded file exceeds the upload_max_filesize directive in php.ini"; 
                break; 
            case UPLOAD_ERR_FORM_SIZE: 
                $message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form"; 
                break; 
            case UPLOAD_ERR_PARTIAL: 
                $message = "The uploaded file was only partially uploaded"; 
                break; 
            case UPLOAD_ERR_NO_FILE: 
                $message = "No file was uploaded"; 
                break; 
            case UPLOAD_ERR_NO_TMP_DIR: 
                $message = "Missing a temporary folder"; 
                break; 
            case UPLOAD_ERR_CANT_WRITE: 
                $message = "Failed to write file to disk"; 
                break; 
            case UPLOAD_ERR_EXTENSION: 
                $message = "File upload stopped by extension"; 
                break; 

            default: 
                $message = "Unknown upload error"; 
                break; 
        } 
        return $message; 
    } 
} 

// Use 
if ($_FILES['file']['error'] === UPLOAD_ERR_OK) { 
//uploading successfully done 
} else { 
throw new UploadException($_FILES['file']['error']); 
} 
?>