帝国cms(EmpireCMS)取内容简介标签，并限制字数

1.帝国cms(Phome)取内容简介标签，并限制字符数量

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                            <a href="http://www.maijialuntan.com/qk_teat/?id=3" target="_blank">互联网又来一波裁员潮？知乎被 锤子</a>
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                            <span class="iconfont icon-time">&nbsp;2020-10-22&nbsp;&nbsp;</span>
                            <span class="iconfont icon-hot"><?=esub($navinfor[smalltext],字数)?></span> //内容简介标签//
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