1.我的header模板:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="dist/css/bootstrap.css">
<script src="jquery-3.2.1.js"></script>
<script src="dist/js/bootstrap.js"></script>
<style>
footer{
line-height: 50px;
}
</style>
<title>YourTitle</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<nav class="navbar navbar-default navbar-inverse">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Serendipity-Ling</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">首页 <span class="sr-only">(current)</span></a></li>
<li><a href="#">路线</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">分类<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">搜索</button>
</form>
<ul class="nav navbar-nav navbar-right">
<!--<li><a href="#">联系我</a></li>-->
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">关于 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">QQ</a></li>
<li><a href="#">We Chat</a></li>
<li><a href="#">Mail</a></li>
<!--<li role="separator"></li>-->
<!--<li><a href="#">Separated link</a></li>-->
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</div>
</div> <!-- header-->
2. 我的footer模板:
<div class="row"><!-- footer--> <div class="col-md-12"> <footer class="navbar navbar-default navbar-inverse text-center"> <span><a href="#">凌真华的博客</a></span> </footer> </div> </div> </div> </body> </html>

3. 当两份模板做好后,采用php里的include函数
首先我先建立一个公共文件夹,文件夹名为inc。讲上面的两个模板各自保存为php文件,取名header.php和footer.php, 放在inc里。
采用下面的代码,将这两个模板放在同一页面
<?php include_once 'inc/header.php' ?> <!-- 页面主体内容--> <div height="200px" style="background-color: skyblue;border: 1px solid black;margin-bottom: 20px"> <h2>大家好,我是页面主体内容</h2></div> <?php include_once 'inc/footer.php' ?>

include与require的区别:
require一个文件存在错误的话,那么程序就会中断执行了,并显示致命错误
include一个文件存在错误的话,那么程序不会中端,而是继续执行,并显示一个警告错误。
include_once:表示只将文件导入一次
include一般是放在流程控制的处理部分中PHP程序网页在读到include的文件时,才将它读进来。这种方式可以把程序执行时的流程简单化。
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