zc100/template/pc/common/include/tdk/city.htm

<?php
if(isset($seo_title) && !empty($seo_title)){ ?>

    <title>{$seo_title}</title>
    <meta name="keywords" content="{$seo_keywords}">
    <meta name="description" content="{$seo_description}">

<?php }else{ ?>

    <title>{eyou:global name='web_title' /}</title>
    <meta name="keywords" content="{eyou:global name='web_keywords' /}">
    <meta name="description" content="{eyou:global name='web_description' /}">

<?php } ?>