Q:

Manipulate HTML page via PHP

Hello I have INCLUDED a PHP file in the end of an HTML page. Now I want to add a style file before the end of the tag HEAD. But I need to do this via this php file, I have no choice. 
I have and index.php file and at the end of this file I am loading script.php
I need to add a script in the header of index page using the script.php
Folder structure:

index.php
script.php

The index.php file have this code:
<!DOCTYPE html>

<html>
 something
</head>

<body>
   something
</body>
</html>
<?php 
   include "script.php"
?>

How can I put something in the head of the HTML/PHP when I have the script.php file at the end of a page.

A:

There is no direct way to do this. I can think about 2 nasty workarounds for your problem though:

If the script has buffering activated (called ob_start somewhere before HEAD was closed), you could get it as a string and clean it wirh ob_get_clean, then insert your code and ECHO it again. Could look like this:
<?php
$output = ob_get_clean();
$output = substr_replace($output, $your_code, strpos($output, '</head>'), 0);
echo $output;
?>

Since modern browsers are quite forgiving, you actually can put style tags after the closing html and they will still work. I woudln't do this though, since it's bad habit

