How to determine login in phpcmsv9

phpcms v9 determines login:

First get the userid

{php$userid=param::get_cookie('_userid');}

and then determine whether it is empty

{if $userid}。。。这里写已经登录之后的代码。。。{else}。。。这里写已经登录之后的代码。。。{/if}

Complete code:

{php$userid=param::get_cookie('_userid');$forward=trim($url);}
{if$userid}
登录后的内容
{else}
<<span >ahref="{APP_PATH}index.php?m=member&c=index&a=login&forward={urlencode($url)}&siteid={$siteid}"target="_top">

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