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                ## 1、include 可以放在PHP腳本的任意位置,當PHP腳本執行到include指定引入的文件時,才將它包含并嘗試執行。當第二次遇到相同文件時,PHP還是會重新解釋一次,include相對于require的執行效率下降很多。 ## 2、require require函數一般放在PHP腳本的最前面,當它在同一個網頁中解釋過一次后,第二次便不會解釋。 ## 3、include_once、 require_once 分別與require / include作用相同,不同的是他們在執行到時會先檢查目標內容是不是在之前已經導入過,如果導入過了,那么便不會再次重復引入其同樣的內容。
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