PHP parsing on includes
include, parsing, php
Solution
Actually `include` and `require` are identical in all except `require` will fail with `E_ERROR` while `include` will issue a warning. Also both of the statements are only activated when they actually executed inside script. So the following code will always work:
<?php
echo "Hello world";
if (0) require "non_existing.php";
The answer to your question is that `index.php` will be parsed first and executed. Then when `include "init.php"` encountered the file `init.php` is parsed and executed within current scope. The same for `layout/header.php` - it will be parsed first.
As already noted `init.php` will be parsed and executed each time `include` / `require` is called, so you probably will want to use `include_once` or `require_once`.
Problem
I'm including a file init.php which defines path constants. So if I include init.php in a file (index.php) and then in another file (layout/header.php)... is init.php parsed before being added to these files or is it added to the parent file and then the parent file is parsed as a whole? EDIT: Why this is important is because init.php defines path variables relative to location of where it is parsed.