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我目前正在学习 PHP,并且我已经看到了一些用它编写的命令,有些命令没有括号。我在网上看了看,但我似乎无法找到原因的解释。
我正在谈论的事情是:
include "header.php";
与:
include ("header.php");
我也看到了同样的echo命令。有人可以向我解释这些的区别吗?
echo