PHP created pages behave no differently than pure html pages. The difference is that it can become a maze to find where a particular section is generated, or even impossible to alter part of the page which has already been output.
The method above works, but you might run into a situation where you're still confused.
First:
Look through your PHP, all the layers of includes, and find where that section is generated. That's step one.
Second:
If you do find that you cannot access the head section, it may be time to reorganize your script. In most basic terms, you'll be creating a templating system. You will make the very end of your script all the output (Doctype through </html>), and everything above will be saved into variables to be output later. As a simplistic example:
PHP Code:
<?php
$head = '<script>....';
$body = 'hello visitors!';
?>
<!Doctype.....>
<html>
<head>
<?php echo $head; ?>
</head>
<body>
<?php echo $body; ?>
</body>
</html>
Of course that won't be too much help in all cases and a real site might have dozens of variables. You might want to change the properties in the body tag so you can have <body <?php echo $bodytagextra; ?>>, which could include an onload event or a background color, though with a complex site I'd suggest trying to move these to external CSS/JS files.
And on that note, it's a good idea to try to move all CSS styles and JS to external files. Remember the only difference is in how it's accessed, not the code itself, so just grab the code, stick it in .css or .js respectively, then include it as an external file rather than writing it to the page. That will make it a lot easier to change.
(Now if you have a style that only affects one page, this is where you would want to write it directly to the head section, in addition to any existing stylesheet(s).)
Overall, remember the purpose of PHP: To generate html. It goes through your code systematically and in the end outputs html as you desire. So basically it's helping you write each page. Now you just need to go through extremely carefully to find exactly what part of the code affects exactly what part of the output, and it won't be too hard to adjust how it works.
PHP and DD Scripts
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