MVC PHP

<?




class functions
{
    private $table;
    private $db;

    public function __construct($table = "patient")
    {
        $this->table = $table;
        $this->db = new Database();
    }

    // Ici la suite du code

    function sanitize_my_email($field) {
    $field = filter_var($field, FILTER_SANITIZE_EMAIL);
    if (filter_var($field, FILTER_VALIDATE_EMAIL)) {
      return true;
    } else {
      return false;
    }
    }

// Envoyer un email
    public function sendmail($to_email,$subject,$message,$headers)
    {
            $to =$to_email;
            $sujet =$subject;
            $msg =$message;
            $head =$headers;
            //check if the email address is invalid $secure_check
            $secure_check = sanitize_my_email($to_email);
            if ($secure_check == false) {
                echo "Invalid input";
            } else { //send email
                mail($to, $sujet, $msg, $head);
                echo "This email is sent using PHP Mail";
            }
     }

//upload file and extension tolerable

public function uploadfile($nameOfinput){

     $currentDir = getcwd();
     $uploadDirectory = "/uploads/";

     $errors = []; // Store all foreseen and unforseen errors here

     $fileExtensions = ['jpeg','jpg','png']; // Possible extensions

     $fileName = $_FILES[$nameOfinput]['name'];
     $fileSize = $_FILES[$nameOfinput]['size'];
     $fileTmpName  = $_FILES[$nameOfinput]['tmp_name'];
     $fileType = $_FILES[$nameOfinput]['type'];
     $fileExtension = strtolower(end(explode('.',$fileName)));

     $uploadPath = $currentDir . $uploadDirectory . basename($fileName);

     if (isset($_POST['submit'])) {

         if (! in_array($fileExtension,$fileExtensions)) {
             $errors[] = "This file extension is not allowed. Please upload a JPEG or PNG file";
         }

         if ($fileSize > 2000000) {
             $errors[] = "This file is more than 2MB. Sorry, it has to be less than or equal to 2MB";
         }

         if (empty($errors)) {
             $didUpload = move_uploaded_file($fileTmpName, $uploadPath);

             if ($didUpload) {
                 echo "The file " . basename($fileName) . " has been uploaded";
             } else {
                 echo "An error occurred somewhere. Try again or contact the admin";
             }
         } else {
             foreach ($errors as $error) {
                 echo $error . "These are the errors" . "\n";
             }
         }
     }


}



}




?>