model chat

if(count($query_isi) == 0 && count($query_balasan) == 0) {
                $isi_chat .= '<li class="chat-body">
                                    <ul class="collection">
                                    </ul>
                                  </li>
                                  <li class="center-align chat-footer">
                                    <form id="form-chat" class="col s12" onsubmit="submit_chat()" action="POST" >
                                        <div class="input-field">
                                            <input type="hidden" name="dari_user_ID" id="dari_user_ID" value="'.Session('user_ID').'"/>
                                            <input type="hidden" name="kepada_user_ID" id="kepada_user_ID" value="'.Request('kepada_user_ID').'"/>
                                            <input style="margin-top:5px;" id="icon_prefix" type="text" class="search isi" placeholder="Type here.." name="isi"/>
                                            <a onclick="submit_chat()" style = "margin-top:5px;"><i class="material-icons prefix">send</i></a>
                                        </div>
                                    </form>
                                  </li>';
            } else {

                if(count($query_balasan) != 0) {
                    $isi_chat .= '<li class="chat-body">
                                    <ul class="collection">';
                    foreach($query_balasan as $chat_balasan) {
                        $waktu_balasan = date('Y-m-d', strtotime($chat_balasan->created_at));
                        $isi_chat .= '<li class="collection-item display-flex avatar pl-5 pb-0" data-target="slide-out-chat">
                                            <span class="avatar-status avatar-online avatar-50">
                                                <img src="'.$query_header->foto.'" alt="avatar" />
                                            </span>
                                            <div class="user-content speech-bubble">
                                                <p class="medium-small">'.$chat_balasan->isi.'</p>
                                            </div>
                                        </li>';

                    }
                    if(count($query_isi) != 0) {
                        foreach($query_isi as $chat_isi) {
                            $waktu_isi = date('Y-m-d', strtotime($chat_isi->created_at));
                            $isi_chat .= '<li class="collection-item display-flex avatar justify-content-end pl-5 pb-0" data-target="slide-out-chat">
                                        <div class="user-content speech-bubble-right">
                                            <p class="medium-small">'.$chat_isi->isi.'</p>
                                        </div>
                                      </li>
                                      <li class="collection-item display-flex avatar pl-5 pb-0" data-target="slide-out-chat">
                                                    <span class="avatar-status avatar-online avatar-50">
                                                        <img src="'.$query_header->foto.'" alt="avatar" />
                                                    </span>
                                                    <div class="user-content speech-bubble">
                                                        <p class="medium-small">'.$chat_balasan->isi.'</p>
                                                    </div>
                                        </li>';
                        }
                        if($waktu_balasan > $waktu_isi) {
                            foreach($query_balasan as $chat_balasan) {

                                $isi_chat .= '<li class="collection-item display-flex avatar pl-5 pb-0" data-target="slide-out-chat">
                                                    <span class="avatar-status avatar-online avatar-50">
                                                        <img src="'.$query_header->foto.'" alt="avatar" />
                                                    </span>
                                                    <div class="user-content speech-bubble">
                                                        <p class="medium-small">'.$chat_balasan->isi.'</p>
                                                    </div>
                                                </li>';

                            }
                        }
                    }


                } else if (count($query_isi) != 0 && count($query_balasan) == 0) {
                    $isi_chat .= '<li class="chat-body">
                                    <ul class="collection">';

                    foreach($query_isi as $chat_isi) {
                        $isi_chat .= '<li class="collection-item display-flex avatar justify-content-end pl-5 pb-0" data-target="slide-out-chat">
                                    <div class="user-content speech-bubble-right">
                                        <p class="medium-small">'.$chat_isi->isi.'</p>
                                    </div>
                                    </li>';
                    }

                    foreach($query_balasan as $chat_balasan) {
                        $isi_chat .= '<li class="collection-item display-flex avatar pl-5 pb-0" data-target="slide-out-chat">
                                            <span class="avatar-status avatar-online avatar-50">
                                                <img src="'.$query_header->foto.'" alt="avatar" />
                                            </span>
                                            <div class="user-content speech-bubble">
                                                <p class="medium-small">'.$chat_balasan->isi.'</p>
                                            </div>
                                        </li>';

                    }
                }