$buffer = str_replace(
        '</head>',
        '<style>.slick-arrow{color:#999!important;font-size:24px!important;z-index:10!important;background:transparent!important;cursor:pointer!important}.snext.slick-arrow{right:10px!important;left:auto!important;position:absolute!important;top:50%!important;width:36px!important;height:36px!important;display:flex!important;align-items:center!important;justify-content:center!important}.sprev.slick-arrow{left:10px!important;right:auto!important;position:absolute!important;top:50%!important;width:36px!important;height:36px!important;display:flex!important;align-items:center!important;justify-content:center!important}#column_1640543673296{display:none!important}.backstage-hotSpotBox{display:none!important}#outerContainer_1560392761599{display:none!important}</style><script>document.addEventListener("click",function(e){try{var qn=e.target.closest("[class*=sitewidget-quickNav]");if(qn&&qn.querySelector(".sitewidget-hd")&&qn.querySelector(".sitewidget-bd")&&!qn.querySelector(".sitewidget-bd").contains(e.target)){var bd=qn.querySelector(".sitewidget-bd");var i=qn.querySelector(".sitewidget-thumb");if(getComputedStyle(bd).display==="none"){bd.style.display="block";if(i)i.className=i.className.replace("fa-angle-down","fa-angle-up")}else{bd.style.display="none";if(i)i.className=i.className.replace("fa-angle-up","fa-angle-down")}}}}catch(e){}});</script></head>',
        $buffer
    );
    return $buffer;);
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'core\basic\Kernel' not found in /www/wwwroot/www.singi.com/core/start.php:17
Stack trace:
#0 /www/wwwroot/www.singi.com/index.php(23): require()
#1 {main}
  thrown in <b>/www/wwwroot/www.singi.com/core/start.php</b> on line <b>17</b><br />