This is the name of the directory where compiled templates are located. By default this is "./templates_c", meaning that it will look for the compile directory in the same directory as the executing php script.
此變數的值為編輯完的樣版檔會存放的的目錄位置，預設值是 "./templates_c"， 代表的意義為執行 php 程式檔相同目錄下的 templates_c 子目錄。
Technical Note: This setting must be either a relative or absolute path. include_path is not used for writing files.
技術提醒： 此一設定可以是相對或絕對路徑。include_path 變數值所包含的目錄不會寫入檔案。
Technical Note: It is not recommended to put this directory under the web server document root.
技術提醒： 不建議將此變數的值設定在網頁伺服器的根目錄之下。