在PHP中，include()到底如何工作? [英] In PHP, how does include() exactly work?

问题描述

include('./code.php');如何工作?我了解这等同于将代码直接粘贴"到包含发生的位置，但是，例如:

How does include('./code.php'); work? I understand it is the equivalent of having the code "pasted" directly where the include occurs, but, for example:

如果我有两个页面，分别是page1.php和page2.php，我需要在./code.php中操纵不同的变量和函数，include()是否创建./code.php的副本，或者实质上是链接回到实际页面./code.php?

If I have two pages, page1.php and page2.php, of which I would need to manipulate different variables and functions in ./code.php, does include() create a copy of ./code.php, or does it essentially link back to the actual page ./code.php?

推荐答案

请参见手册.

如果您include文本文件，它将在文档中显示为文本.

If you include a text file, it will show as text in the document.

include 不的行为类似于复制粘贴:

include does not behave like copy-paste:

test.php

<?php
echo '**';
$test = 'test';
include 'test.txt';
echo '**';
?>

test.txt

echo $test;

上面的示例将输出:

**echo $test;**

如果要包含PHP文件，则仍需要具有PHP标签<?php和?>.

If you are going to include PHP files, you still need to have the PHP tags <?php and ?>.

此外，通常不会在include之后加上括号，如下所示:

Also, normally parentheses are not put after include, like this:

include 'test.php';

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