PHP преобразовать строку с числом в строку

помогите решить задачку:

$idlink = '{id}';   // здесь данные вставляются в переменную из json
$idcalc = $idlink + 3;
echo $idcalc;

Результат вывода будет равен 3, т.е. сложения не происходит. '{id}' - всегда равна числу, например 57 $idlink - имеет тип строки, я так понимаю из-за этого и не происходит правильного расчета. Но если я преобразую строку в integer, то $idlink у меня равен 0. Возможно я делаю это не правильно. Спасибо.

Сама страница:

  <?php
/*
 * ------------------------------------------------------------------------
 * JA Filter Plugin - Docman
 * ------------------------------------------------------------------------
 * Copyright (C) 2004-2016 J.O.O.M Solutions Co., Ltd. All Rights Reserved.
 * @license - GNU/GPL, http://www.gnu.org/licenses/gpl.html
 * Author: J.O.O.M Solutions Co., Ltd
 * Websites: http://www.joomlart.com - http://www.joomlancers.com
 * This file may not be redistributed in whole or significant part.
 * ------------------------------------------------------------------------
 */

defined('_JEXEC') or die;
?>
{#data}
<div class="item product product-item">
    <div data-container="product-grid" onclick="window.location='{url}';" class="product-item-info {?thumbnail}{:else} no-image {/thumbnail} {@eq key=featured value="1"} featured {/eq}">
        <div class="product-item-details item-{id}" data-id="{id}">
            {@info:data}
                <div class="row {._class} {render_class}">
                  {?.key}<div class="col-md-6 {label_render_class}">{.key}</div>{/.key}
                  <div class="col-md-{?.key}6{:else}12{/.key} {.val_class}">
                  {@select key=._class}
                    {@eq value="name"}
                        <h4 class="product-item-name">
                            <a href="{url}" class="product-item-link">
                                <span class="k-icon-document-{icon|s}"> </span>
                                {name|s}
                            </a>
                        </h4>
                    {/eq}
                    {@eq value="thumb"}
                    
                    
                    
<?                    
$idlink = '{id}';   // здесь данные вставляются в переменную из json
$idcalc = $idlink + 3;
echo $idcalc;
?>
                        
                        
                        
                        
                        
                    {/eq}
                    {@eq value="desc"}
                        {desc|s}
                        
                    {/eq}
                    {@eq value="author"}
                        {?ucf.avatar}
                            <img src="<?php echo JUri::base(true) ?>/{ucf.avatar}" />
                        {:else}
                            {.value|s}
                        {/ucf.avatar}
                    {/eq}
                    {@none}
                        {.value|s}
                    {/none}
                  {/select}
                  </div>
                </div>
            {/info}
        </div>
        <div class="product-item-actions">
            <a class="btn btn-default" href="{url}"><?php echo JText::_('COM_JAMEGAFILTER_VIEW_DETAIL'); ?></a>
        </div>
    </div>
</div>
{/data}

Сам JSON:

{"item_57":{"id":"57","lang":"ru-RU","hits":0,"name":"\u041a\u0432\u0430\u0440\u0442\u0438\u0440\u0430 \u0434\u0432\u0443\u0448\u043a\u0430","thumbnail":"","desc":"5 rooms, 2 bathrooms, garage, door, window.High quality design near be sea. ","url":"\/items\/apartments\/15-alaniya\/center\/57-kvartira-dvushka","attr":{"name":{"frontend_value":"\u041a\u0432\u0430\u0440\u0442\u0438\u0440\u0430 \u0434\u0432\u0443\u0448\u043a\u0430","title":["Title"],"type":"value"},"cat":{"value":["15","12"],"frontend_value":["\u0410\u043b\u0430\u043d\u0438\u044f » \u0426\u0435\u043d\u0442\u0440","\u0410\u043b\u0430\u043d\u0438\u044f"],"title":["\u041b\u043e\u043a\u0430\u0446\u0438\u044f"],"type":"dropdown"},"ct6":{"value":"45","frontend_value":"45","title":["Area"],"type":"numberrange"},"ct7":{"value":"30000","frontend_value":"30000","title":["\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c"],"type":"numberrange"},"ct13":{"value":["rent"],"frontend_value":["\u0414\u0430"],"title":["\u0413\u0440\u0430\u0436\u0434\u0430\u043d\u0441\u0442\u0432\u043e"],"type":"dropdown"},"ct18":{"value":["%D0%94%D1%83%D0%BF%D0%BB%D0%B5%D0%BA%D1%81"],"frontend_value":["\u0414\u0443\u043f\u043b\u0435\u043a\u0441"],"title":["\u041a\u043e\u043c\u043d\u0430\u0442\u044b"],"type":"select"},"ct19":{"value":["%D0%92%D0%B8%D0%BB%D0%BB%D0%B0"],"frontend_value":["\u0412\u0438\u043b\u043b\u0430"],"title":["\u0410\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b"],"type":"dropdown"},"ct21":{"value":"1542322","frontend_value":"1542322","title":["ID"],"type":"value"},"ct22":{"value":["50.000%20-%20100.000","100.000%20-%20200.000","200.000%20-%20300.000"],"frontend_value":["50.000 - 100.000","100.000 - 200.000","200.000 - 300.000"],"title":["Price"],"type":"dropdown"},"ct26":{"value":["%D0%9D%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0"],"frontend_value":["\u041d\u043e\u0432\u043e\u0441\u0442\u0440\u043e\u0439\u043a\u0430"],"title":["\u0422\u0438\u043f \u0436\u0438\u043b\u044c\u044f"],"type":"dropdown"}},"featured":"1","access":"1","ucf":{"avatar":"images\/joomlart\/team\/item-1.jpg"},"cmt_gallery":{"src":["images\/11\/20210408193043834296329o.jpg","images\/11\/27173286512962220648konak-city-towers-in-alanya (13).jpg"],"class":["",""],"caption":["",""]}},"item_56":{"id":"56","lang":"ru-RU","hits":0,"name":"Vip Room","thumbnail":"images\/mahmutlar-alanya-271356_.jpg","desc":"5 rooms, 2 bathrooms, garage, door, window.High quality design near be sea. ","url":"\/items\/apartments\/41-alaniya\/oba\/56-kvartira-vozle-morya-3","attr":{"name":{"frontend_value":"Vip Room","title":["Title"],"type":"value"},"cat":{"value":["41","12"],"frontend_value":["\u0410\u043b\u0430\u043d\u0438\u044f » \u041e\u0431\u0430","\u0410\u043b\u0430\u043d\u0438\u044f"],"title":["\u041b\u043e\u043a\u0430\u0446\u0438\u044f"],"type":"dropdown"},"ct6":{"value":"65","frontend_value":"65","title":["Area"],"type":"numberrange"},"ct7":{"value":"47000","frontend_value":"47000","title":["\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c"],"type":"numberrange"},"ct13":{"value":["sale"],"frontend_value":["\u041d\u0435\u0442"],"title":["\u0413\u0440\u0430\u0436\u0434\u0430\u043d\u0441\u0442\u0432\u043e"],"type":"dropdown"},"ct18":{"value":["2%2B1","3%2B1","%D0%94%D1%83%D0%BF%D0%BB%D0%B5%D0%BA%D1%81"],"frontend_value":["2+1","3+1","\u0414\u0443\u043f\u043b\u0435\u043a\u0441"],"title":["\u041a\u043e\u043c\u043d\u0430\u0442\u044b"],"type":"select"},"ct19":{"value":["%D0%A0%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%86%D0%B8%D1%8F"],"frontend_value":["\u0420\u0435\u0437\u0438\u0434\u0435\u043d\u0446\u0438\u044f"],"title":["\u0410\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b"],"type":"dropdown"},"ct21":{"value":"1456456","frontend_value":"1456456","title":["ID"],"type":"value"},"ct22":{"value":["200.000%20-%20300.000"],"frontend_value":["200.000 - 300.000"],"title":["Price"],"type":"dropdown"},"ct26":{"value":["%D0%9D%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0"],"frontend_value":["\u041d\u043e\u0432\u043e\u0441\u0442\u0440\u043e\u0439\u043a\u0430"],"title":["\u0422\u0438\u043f \u0436\u0438\u043b\u044c\u044f"],"type":"dropdown"}},"featured":"1","access":"1","ucf":{"avatar":"images\/joomlart\/team\/item-1.jpg"},"cmt_gallery":{"src":["images\/CEI-TR-17-20.jpg","images\/376e2e826ef05422273ec4ce4aeea6a7.jpg","images\/CEI-TR-17-20.jpg","images\/mahmutlar-alanya-271356_.jpg"],"class":["","","",""],"caption":["","","",""]}},"item_55":{"id":"55","lang":"ru-RU","hits":0,"name":"\u0428\u0438\u043a\u0430\u0440\u043d\u044b\u0435 \u0430\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b","thumbnail":"images\/CEI-TR-17-20.jpg","desc":"5 rooms, 2 bathrooms, garage, door, window.High quality design near be sea. ","url":"\/items\/apartments\/14-gazipasha\/55-kvartira-vozle-morya-2","attr":{"name":{"frontend_value":"\u0428\u0438\u043a\u0430\u0440\u043d\u044b\u0435 \u0430\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b","title":["Title"],"type":"value"},"cat":{"value":["14"],"frontend_value":["\u0413\u0430\u0437\u0438\u043f\u0430\u0448\u0430"],"title":["\u041b\u043e\u043a\u0430\u0446\u0438\u044f"],"type":"dropdown"},"ct6":{"value":"44","frontend_value":"44","title":["Area"],"type":"numberrange"},"ct7":{"value":"33000","frontend_value":"33000","title":["\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c"],"type":"numberrange"},"ct13":{"value":["rent"],"frontend_value":["\u0414\u0430"],"title":["\u0413\u0440\u0430\u0436\u0434\u0430\u043d\u0441\u0442\u0432\u043e"],"type":"dropdown"},"ct18":{"value":["2%2B1"],"frontend_value":["2+1"],"title":["\u041a\u043e\u043c\u043d\u0430\u0442\u044b"],"type":"select"},"ct19":{"value":["%D0%A0%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%86%D0%B8%D1%8F"],"frontend_value":["\u0420\u0435\u0437\u0438\u0434\u0435\u043d\u0446\u0438\u044f"],"title":["\u0410\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b"],"type":"dropdown"},"ct21":{"value":"11342356","frontend_value":"11342356","title":["ID"],"type":"value"},"ct22":{"value":["100.000%20-%20200.000"],"frontend_value":["100.000 - 200.000"],"title":["Price"],"type":"dropdown"},"ct26":{"value":["%D0%92%D1%82%D0%BE%D1%80%D0%B8%D1%87%D0%BA%D0%B0"],"frontend_value":["\u0412\u0442\u043e\u0440\u0438\u0447\u043a\u0430"],"title":["\u0422\u0438\u043f \u0436\u0438\u043b\u044c\u044f"],"type":"dropdown"}},"featured":"1","access":"1","ucf":{"avatar":"images\/joomlart\/team\/item-1.jpg"},"cmt_gallery":{"src":["images\/azura_park_room_1.jpg","images\/376e2e826ef05422273ec4ce4aeea6a7.jpg","images\/CEI-TR-17-20.jpg","images\/mahmutlar-alanya-271356_.jpg"],"class":["","","",""],"caption":["","","",""]}},"item_54":{"id":"54","lang":"ru-RU","hits":0,"name":"\u041a\u0432\u0430\u0440\u0442\u0438\u0440\u0430 \u0432\u043e\u0437\u043b\u0435 \u043c\u043e\u0440\u044f","thumbnail":"images\/376e2e826ef05422273ec4ce4aeea6a7.jpg","desc":"5 rooms, 2 bathrooms, garage, door, window.High quality design near be sea. ","url":"\/items\/apartments\/13-mersin\/54-kvartira-vozle-morya","attr":{"name":{"frontend_value":"\u041a\u0432\u0430\u0440\u0442\u0438\u0440\u0430 \u0432\u043e\u0437\u043b\u0435 \u043c\u043e\u0440\u044f","title":["Title"],"type":"value"},"cat":{"value":["13"],"frontend_value":["\u041c\u0435\u0440\u0441\u0438\u043d"],"title":["\u041b\u043e\u043a\u0430\u0446\u0438\u044f"],"type":"dropdown"},"ct6":{"value":"93","frontend_value":"93","title":["Area"],"type":"numberrange"},"ct7":{"value":"50000","frontend_value":"50000","title":["\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c"],"type":"numberrange"},"ct13":{"value":["sale"],"frontend_value":["\u041d\u0435\u0442"],"title":["\u0413\u0440\u0430\u0436\u0434\u0430\u043d\u0441\u0442\u0432\u043e"],"type":"dropdown"},"ct18":{"value":["%D0%94%D1%83%D0%BF%D0%BB%D0%B5%D0%BA%D1%81%204%2B1"],"frontend_value":["\u0414\u0443\u043f\u043b\u0435\u043a\u0441 4+1"],"title":["\u041a\u043e\u043c\u043d\u0430\u0442\u044b"],"type":"select"},"ct19":{"value":["%D0%A0%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%86%D0%B8%D1%8F"],"frontend_value":["\u0420\u0435\u0437\u0438\u0434\u0435\u043d\u0446\u0438\u044f"],"title":["\u0410\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b"],"type":"dropdown"},"ct21":{"value":"1143534","frontend_value":"1143534","title":["ID"],"type":"value"},"ct22":{"value":["200.000%20-%20300.000"],"frontend_value":["200.000 - 300.000"],"title":["Price"],"type":"dropdown"},"ct26":{"value":["%D0%92%D1%82%D0%BE%D1%80%D0%B8%D1%87%D0%BA%D0%B0"],"frontend_value":["\u0412\u0442\u043e\u0440\u0438\u0447\u043a\u0430"],"title":["\u0422\u0438\u043f \u0436\u0438\u043b\u044c\u044f"],"type":"dropdown"}},"featured":"1","access":"1","ucf":{"avatar":"images\/joomlart\/team\/item-1.jpg"},"cmt_gallery":{"src":["images\/azura_park_room_1.jpg","images\/376e2e826ef05422273ec4ce4aeea6a7.jpg","images\/CEI-TR-17-20.jpg","images\/mahmutlar-alanya-271356_.jpg"],"class":["","","",""],"caption":["","","",""]}},"item_52":{"id":"52","lang":"ru-RU","hits":0,"name":"\u0422\u0430\u0443\u043d \u0445\u0430\u0443\u0441","thumbnail":"images\/3.jpg","desc":"5 rooms, 2 bathrooms, garage, door, window.High quality design near be sea. ","url":"\/items\/apartments\/11-antaliya\/52-taun-khaus","attr":{"name":{"frontend_value":"\u0422\u0430\u0443\u043d \u0445\u0430\u0443\u0441","title":["Title"],"type":"value"},"cat":{"value":["11"],"frontend_value":["\u0410\u043d\u0442\u0430\u043b\u0438\u044f"],"title":["\u041b\u043e\u043a\u0430\u0446\u0438\u044f"],"type":"dropdown"},"ct6":{"value":"150","frontend_value":"150","title":["Area"],"type":"numberrange"},"ct7":{"value":"90000","frontend_value":"90000","title":["\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c"],"type":"numberrange"},"ct13":{"value":["sale"],"frontend_value":["\u041d\u0435\u0442"],"title":["\u0413\u0440\u0430\u0436\u0434\u0430\u043d\u0441\u0442\u0432\u043e"],"type":"dropdown"},"ct18":{"value":["3%2B1"],"frontend_value":["3+1"],"title":["\u041a\u043e\u043c\u043d\u0430\u0442\u044b"],"type":"select"},"ct19":{"value":["%D0%A0%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%86%D0%B8%D1%8F"],"frontend_value":["\u0420\u0435\u0437\u0438\u0434\u0435\u043d\u0446\u0438\u044f"],"title":["\u0410\u043f\u043f\u0430\u0440\u0442\u0430\u043c\u0435\u043d\u0442\u044b"],"type":"dropdown"},"ct21":{"value":"13467833","frontend_value":"13467833","title":["ID"],"type":"value"},"ct22":{"value":["300.000%20-%20%D0%B1%D0%B5%D0%B7%20%D0%BB%D0%B8%D0%BC%D0%B8%D1%82%D0%B0"],"frontend_value":["300.000 - \u0431\u0435\u0437 \u043b\u0438\u043c\u0438\u0442\u0430"],"title":["Price"],"type":"dropdown"},"ct26":{"value":["%D0%9D%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0"],"frontend_value":["\u041d\u043e\u0432\u043e\u0441\u0442\u0440\u043e\u0439\u043a\u0430"],"title":["\u0422\u0438\u043f \u0436\u0438\u043b\u044c\u044f"],"type":"dropdown"}},"featured":"1","access":"1","ucf":{"avatar":"images\/joomlart\/team\/item-1.jpg"},"cmt_gallery":{"src":["images\/17189790.jpg","images\/17482984.jpg"],"class":["",""],"caption":["",""]}}}