<?php if(!function_exists('插件的标签')){emMsg('XX插件未安装或者未启用', BLOG_URL.'admin/plugin.php');}?>

<?php $DB = MySql::getInstance();$slsql = $DB->query("SELECT * FROM `".DB_PREFIX."options` WHERE `option_value` like '%插件名称%'");
if($DB->num_rows($slsql) < 0){emMsg('XX插件未安装或者未启用', BLOG_URL.'admin/plugin.php');}?>