如何区分何时插入和何时更新

Question

我有3对文本框，它的文件输入文本框列出了用户上传的文件。最后一对是空白的（用户尚未上传任何文件）。

比方说，用户上传了一个新文件以更新第一对，并选择一个新文件插入最后一对，我如何与下面的代码区分开来何时更新和何时插入。

非常感谢您的帮助。谢谢

    $target_path = "upload/doc_client_document/"; 
    if(isset($_FILES['docUpload']))
    {
        $CLIENT_PROJET_ID = $_POST['TXTCLIENT_PROJET_ID'];
        $CLIENT_ID = $_POST['TXTCLIENT_ID'];
        $PROJET_ID = $_POST['TXTPROJET_ID'];

        foreach($_FILES['docUpload']["name"] AS $key=>$file)
        {
            $DOC_CLIENT_ID = $key;
            //echo "<pre>";print_r($file);echo "</pre>";

            foreach($file AS $keyz=>$filez) 
            {
                $CLIENT_PROJET_DOC_CLIENT_ID = $keyz;
                //echo "<pre>";print_r($filez);echo "</pre>";echo "<br>";

                $filezx = $filez["'docUpload'"];
                $file = $_FILES['docUpload']['name'][$key][$keyz]["'docUpload'"];
                $file_tmp = $_FILES['docUpload']['tmp_name'][$key][$keyz]["'docUpload'"];
                $file_name = basename($file);
                //move_uploaded_file($file_tmp, $target_path. $file);

                if(move_uploaded_file($file_tmp, $target_path. $file))
                {
                    $DOC_CLIENT_NOM = $target_path.$file;

                    //echo "<pre>";print_r($DOC_CLIENT_NOM);echo "</pre>";
                    //echo "<pre>";print_r($docfiles);echo "</pre>";
                    //echo "<pre>";print_r($filez["'docUpload'"]);echo "</pre>";echo "<br>";

                    if(isset($DOC_CLIENT_NOM) && $DOC_CLIENT_NOM <> "" &&  $keyz["'docUpload'"] <> "")
                    {
                        $tableProjetTaches = new table("client_projet_doc_client");

                        $tableProjetTaches -> set('CLIENT_PROJET_ID', $CLIENT_PROJET_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_ID', $CLIENT_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('PROJET_ID', $PROJET_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('DOC_CLIENT_ID', $DOC_CLIENT_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_MODELE_DOC', $DOC_CLIENT_NOM, PDO::PARAM_STR);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_USER_ID', $userId, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_DATE_CREATION', date('Y-m-d H:i:s'), PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_DATE_MAJ', date('Y-m-d H:i:s'), PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_STATUT', 1, PDO::PARAM_INT);

                        if ($tableProjetTaches->insert())
                            $success = 'Ajout réussie.';
                    }
                    else
                    {
                        $tableProjetTaches = new table("client_projet_doc_client");

                        $tableProjetTaches -> set('CLIENT_PROJET_ID', $CLIENT_PROJET_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_ID', $CLIENT_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('PROJET_ID', $PROJET_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('DOC_CLIENT_ID', $DOC_CLIENT_ID, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_MODELE_DOC', $DOC_CLIENT_NOM, PDO::PARAM_STR);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_USER_ID', $userId, PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_DATE_CREATION', date('Y-m-d H:i:s'), PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_DATE_MAJ', date('Y-m-d H:i:s'), PDO::PARAM_INT);
                        $tableProjetTaches -> set('CLIENT_PROJET_DOC_CLIENT_STATUT', 1, PDO::PARAM_INT);

                        $condition = array('CLIENT_PROJET_DOC_CLIENT_ID = ' . $keyz);
                        if ($tableProjetTaches->update($condition))
                            $success = 'Modification service réussie.';

                    }

                }
            }
        }
    }