What is the best way to include a style sheet for a specific page?

thank you for viewing.

My website includes the same header and footer for each page using PHP.

I wanted a style sheet that only applied specifically for a certain page, so put the style in using the appropriate tag.

...<body><style type="text/css"> /* what ever */ </style></body>...

The style sheet is processed correctly in all browsers I tested, however it is not validated correctly by W3C because it's located inside the body tag instead of the head.

My question is:
If I can't put the style sheet in the body tag, what is the best way to include it? I can reference the style sheet in the PHP header, but I'd rather not have another HTTP Request for such a small file. How would you do it? What is the least sloppy way to do it? Although the style tag shouldn't be in <body>, it is still processed correctly by browsers.

Solution

The best way would be to use a MVC framework that buffers your view file, and allow tag to be dynamically added to the head before output.

Here is a ultra simple way of doing it:

index.php:

<?php
class Page {
    private static $head = array();
    private static $content = '';
    static function add_head($tag) {
        self::$head[] = $tag;
    }
    static function render_head() {
        foreach (self::$head as $tag) echo $tag;
    }
    static function render_content() {
        echo self::$content;
    }
    static function read_content($file) {
        ob_start();
        require $file;
        self::$content = ob_get_clean();
    }
    static function render_layout($file) {
        require $file;
    }
}

Page::read_content('view.php');
Page::render_layout('layout.php');
?>

layout.php:

<html>
    <head><?php Page::render_head(); ?></head>
    <body>
        <div id="header"></div>

        <div id="content"><?php Page::render_content(); ?></div>

        <div id="footer"></div>
    </body>
</html>

view.php:

<?php Page::add_head('<title>Hello World!</title>'); ?>
<h1>Hello</h1>
<p>World</p>