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                DEFINED標簽用于判斷某個常量是否有定義,用法如下: <defined name="NAME"> NAME常量已經定義 </defined> <defined name="NAME"> NAME常量已經定義 </defined> name屬性的值要注意嚴格大小寫如果判斷沒有被定義,可以使用: <notdefined name="NAME"> NAME常量未定義 </notdefined> <notdefined name="NAME"> NAME常量未定義 </notdefined> 可以把上面兩個標簽合并成為: <defined name="NAME"> NAME常量已經定義 <else /> NAME常量未定義 </defined> <defined name="NAME"> NAME常量已經定義 <else /> NAME常量未定義 </defined> <div class="view-foot"> <div class="article-jump"> <span style="display: block;" class="jump-up">上一篇:<a href="/manual/thinkphp /1813" data-articleid="1813">Empty標簽</a></span> <span class="jump-down">下一篇:<a href="/manual/thinkphp/1815" data-articlei d="1815">Assign標簽</a></span> </div> <a class="view-backtop"><i class="icon-arrow-up2"></i></a> </div> </div> <div class="view-foot"> <div class="article-jump"> <span style="display: block;" class="jump-up">上一篇:<a href="/manual/thinkphp /1813" data-articleid="1813">Empty標簽</a></span> <span class="jump-down">下一篇:<a href="/manual/thinkphp/1815" data-articlei d="1815">Assign標簽</a></span> </div> <a class="view-backtop"><i class="icon-arrow-up2"></i></a> </div> </div>
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