有没有一种方法可以在php include中使用另一个文件中的变量? [英] Is there a way to use a variable from another file in a php include?

问题描述

所以基本上我有一个文件，可以说file1.php，它包含另一个file2.php.

So basically I have a file, lets say file1.php and it includes another file2.php.

file1.php包含一个名为$dateString的变量，我对该变量进行了一些操作.

file1.php contains a variable called $dateString that I have performed some operations on.

file2.php也具有称为$dateString的相同变量，但是即使$dateString在包含file2.php之前已初始化，此包含文件中也未引用此变量.

file2.php also has the same variable called $dateString however this variable is not being referenced within this include file even though $dateString was initialized prior to including file2.php.

因此，当前是file1.php的样子:

$dateString = 'some expression';

include 'file2.php';

file2.php基本上是试图回显在file1.php

file2.php is basically trying to echo out the variable that was initialized in file1.php

echo $dateString;

除了一个变量之外，file2.php中的所有其他内容都被正确调用了.

Everything else from file2.php is being called properly except that one variable.

希望这是有道理的.这在PHP中可行吗?我在其他地方已经读到了需要全局设置变量的信息，其他地方提到了如何无法从子文件中的父文件引用变量..有什么想法吗?预先感谢！

Hopefully this makes sense. Is this possible in PHP? I have read in other places that you need to make the variables global and others have mentioned how you cant reference a variable from a parent file within a child file..any thoughts? Thanks in advance!

推荐答案

当您使用PHP的include()时，没有任何神奇的事情发生.所包含文件的代码基本上只是插入到包含该文件的位置，这会导致一个更大的PHP文件.
父"文件还是子"文件并不重要-这是很重要的位置，因为PHP将从顶部到底部解析单个结果文件.

there is nothing magically happening when you use PHP's include(). the included file's code is basically just inserted at the point where you are including it - resulting in one bigger PHP file.
it doesn't really matter if the "parent" or in the "child" file - it's the position that matters since PHP will parse the single resulting file from top to bottom.

例如:如果在包含文件B之前在文件A中设置了变量，则文件B将知道该变量.但是，如果您在包含文件B之后在文件A中设置了变量-文件B不知道该变量.

for example: if you set the variable in file A before including file B, file B will know about the variable. but if you set the variable in file A after including file B - file B doesn't know it.

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