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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                present標簽用于判斷某個變量是否已經定義,用法: ~~~ ~~~ <present name="name"> name已經賦值 </present> ~~~ ~~~ 如果判斷沒有賦值,可以使用: ~~~ ~~~ <notpresent name="name"> name還沒有賦值 </notpresent> ~~~ ~~~ 可以把上面兩個標簽合并成為: ~~~ ~~~ <present name="name"> name已經賦值 <else /> name還沒有賦值 </present> ~~~ ~~~ present標簽的name屬性可以直接使用系統變量,例如: ~~~ ~~~ <present name="Think.get.name"> $_GET['name']已經賦值 </present> ~~~ ~~~
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