In PHP, how does include() exactly work?

Question

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:

Answer 1

See the manual.

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

include does not behave like copy-paste:

test.php

test.txt

echo $test;

The example above will output:

**echo $test;**

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

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

include 'test.php';