我有一个“header.php”文件，我正在使用以下代码将它合并到我的 html 页面中：
<?php /*
$pageTitle = "Home";
$section = "Home";
include('inc/header.php');
?>
PHP 头文件包含许多 CSS 样式表。其中一些 CSS 样式表我只想包含在一个页面上——例如，我只想在“index.php”页面上包含“index.css”。当我在网站的每个页面中使用相同的“header.php”文件时，如何包含这些样式表？
有没有办法在各个页面本身而不是在头文件中指定这些样式？如果是这样，这些样式是否可以放在另一个元素中，即使该元素已经在头文件中使用（打开和关闭）？
这是我的“header.php”文件的代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;">
<title><?php echo $pageTitle ?> || Young Academy </title>
<meta name="description" content="Based in Pinner in North-West London, the Young Academy has been creating the highest standard of musical and dramatic education for 30 years.">
<meta name="keywords" content="Piano, Flute, Music Theory, Singing, Violin, Concerts, Pinner, Middlesex, Harrow, Teacher">
<meta name="author" content="Barbara Young">
<!--Stylesheets!-->
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css"/>
<link rel="stylesheet" type="text/css" media="all" href="css/text.css" />
<link rel="stylesheet" type="text/css" media="all" href="css/960_16_col.css" />
<link rel="stylesheet" type="text/css" media="screen" href="css/style.css"/>
<link rel="stylesheet" type="text/css" media="screen" href="css/contact.css"/>
<!--Google fonts!-->
<link rel="stylesheet" type="text/css" media="all" href="http://fonts.googleapis.com/css?family=Quicksand:400,700">
<link href='http://fonts.googleapis.com/css?family=Titillium+Web' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Noto+Serif:400,700,400italic,700italic' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Karla:400,700,400italic,700italic' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Marck+Script' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Roboto:400,700,500,500italic,400italic' rel='stylesheet' type='text/css'>
**<link rel="stylesheet" type="text/css" media="screen" href="css/index.css"/>
<link rel="stylesheet" type="text/css" media="screen" href="css/bgaudioplayer.css"/>**
<!--Meta tags!-->
<meta name="author" content="Robert Young" />
<meta name="copyright" content="2013 by Robert Young" />
<meta name="keywords" content="Music lessons, Pinner, music tuition, piano lessons, speech and drama, London" />
<meta name="description" content="Site of the Young Academy, a private music tuition business based in Pinner" />
<script src="../js/modernizr.custom.63826.js"></script>
<script src="../js/html5shiv.js"></script>
</head>
<body>
<div class="header">
<div class="container_16 clearfix">
<ul class="nav grid_16 alpha">
<li><a class="<?php if ($section == "Home") {echo "here"; } ?>" href="index.php" accesskey="1"> Home </a></li>
<li><a class="<?php if ($section == "About Us") {echo "here"; } ?>" href="about_us.php" accesskey="2"> About </a></li>
<li><a class="<?php if ($section == "What We Do") {echo "here"; } ?>" href="what_we_do.php" accesskey="3"> What We Do </a></li>
<li><a class="<?php if ($section == "Enrolement") {echo "here" ; } ?>" href="enrolement.php" accesskey="4"> Enrolement </a></li>
<li><a class="<?php if ($section == "Contact Us") {echo "here" ; } ?>" href="contact.php" accesskey="5"> Contact Us </a></li>
<!--<li><a href="http://youngacademyblog.blogspot.co.uk/" accesskey="6"> Blog </a></li>-->
</ul>
<div id="logo">
<a href="index.php"><img src="img/Logo original.gif" alt="The Young Academy"/></a>
</div>
<div class = "grid_4 alpha">
<div class="telephone grid_4 alpha">
<img src="img/phone_icon_white.png" alt="small telephone logo" class="align-left small" />
<p> +44 (0)20 8866 3813 </P>
</div>
<div class="timezone">
<p><?php
date_default_timezone_set('Europe/London');
mktime(0,0,0,1,1,1970);
echo date('l, d F Y');
?> </p>
<!--<form action="http://www.example.com/login.php">
<p>
<input type="text name=search" size="20+" id="search" value="Search this site"
</p>
</form>!-->
</div>
</div>
<ul class="secondmenu grid_6 push_3">
<li><a class="<?php if ($section == "Musical Glossary") {echo "here" ; } ?>" href="glossary.php">Musical Glossary </a></li>
<li><a class="<?php if ($section == "FAQ") {echo "here" ; } ?>" href="faq.php">FAQ</a></li>
<ul>
</div>
我只想在 index.php 页面上以粗体包含样式表。我可以像这样包括它们：
<?php
include('inc/header.php');
?>
<head>
<link rel="stylesheet" type="text/css" media="screen" href="css/index.css"/>
<link rel="stylesheet" type="text/css" media="screen" href="css/bgaudioplayer.css"/>
</head>
<article class="content">
<p class="grid_9 alpha"><i>Outstanding vocal and instrumental tuition.</i></p>
</article>
<article class="second-content">
<p class="grid_6 alpha omega">Develop a passion for music.</p>
</article>
<article class="third-content">
<p class="grid_5 alpha omega">Become a virtuoso.</p>
</article>
等等
任何帮助将非常感激！
谢谢，
罗伯特。