最近在學習PHP時，發現了一個有趣的問題——title 在 PHP 中似乎沒有太大用處。雖然在 HTML 中，title 被廣泛應用于網頁的頭部，但是在 PHP 中，title 的作用其實非常有限。下面，我將向大家詳細介紹PHP中title沒用的原因和一些例子。
首先，我們來看看 PHP 中 title 的定義：
定義title很簡單，直接使用變量即可。但是在實際應用中，為什么 PHP 中 title 很少被使用呢？
舉個例子，假設我們要編寫一個網站的頭部，通常會涉及到一些全局變量、CSS 樣式、JavaScript等等。可以使用如下代碼定義一個簡單頭部：
這段代碼看上去很簡單，只是在網頁頭部插入一個標簽，并將其定義為 PHP 變量 $title。但是仔細一想，這段代碼中的 $title 變量其實并沒有什么實質性的用途。<br>如果我們打開網頁源代碼，可以看到實際上變成了這樣：<br><pre>html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>這是一個標題</title>
<link rel="stylesheet" href="style.css">
<script src="javascript.js"></script>
</head>
<body></pre><br>可以看到，最終生成的 HTML 中的<title>標簽的內容是固定的，而不是我們在 PHP 中定義的 $title 變量。因此，定義 $title 在這個例子中并沒有什么實質性的用途。<br>實際上，PHP 中 title 最常見的用途就是在需要動態生成網頁標題的時候。比如，當訪問不同的頁面時，需要更改網頁的標題，這時候就可以使用 PHP 的 $title 來完成。<br><pre>php
<?php
if (isset($_GET['page'])) {
$page = $_GET['page'];
} else {
$page = 'home';
}
if ($page == 'home') {
$title = '這是主頁';
} else {
$title = '未知頁面';
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title><?php echo $title; ?></title>
</head>
<body>
<?php
if ($page == 'home') {
echo '這是主頁';
} else {
echo '未知頁面';
}
?>
</body>
</html></pre><br>在這個例子中，我們根據 $_GET['page'] 的不同值來決定 $title 變量的值，并在 HTML 中使用<?php echo $title; ?>來動態生成網頁標題。<br>總結起來，PHP 中的 $title 變量雖然沒什么用處，但是在某些情況下，比如需要動態生成網頁標題時，還是非常有用的。不過，在大多數情況下，$title 的作用還是比較有限的。</div><div id="hhpx77n" class="share"></div><div id="hrvb7jz" class="Prev_Next"><div id="dzfl55p" class="box">上一篇<a href="http://52shenghuonet.cn/post/1662795.html">json恢復</a></div><div id="zjfnt5v" class="box">下一篇<a href="http://52shenghuonet.cn/post/1662790.html">json總結</a></div></div></div><div id="r75x55x" class="related related-list"><h5>相關文章</h5><ul><li><a href="http://52shenghuonet.cn/post/1625112.html">php http請求 返回數據包太大 499</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625110.html">php http設置超時有用嗎</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625107.html">php http的請求與響應時間</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625105.html">php http數據流并解析</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625103.html">php http微信加密服務器</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625101.html">php http和https接口測試工具</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625099.html">php https網絡請求數據包</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625097.html">php https 上傳圖片到服務器</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625095.html">php http2 多路復用</a><span>12-21</span></li><li><a href="http://52shenghuonet.cn/post/1625093.html">php http 異步請求數據格式</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1625091.html">php http 發送數據接受數據類型</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1625089.html">php http post過來為什么有</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1625087.html">php http post 二進制流</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1625085.html">php http post 二進制</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1625083.html">php http 500 內部服務器錯誤</a><span>12-20</span></li><li><a href="http://52shenghuonet.cn/post/1420281.html">php curl 返回false</a><span>07-14</span></li><li><a href="http://52shenghuonet.cn/post/1415096.html">php ascii 轉換</a><span>07-17</span></li><li><a href="http://52shenghuonet.cn/post/1327200.html">cas單點認證php客戶端</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1381285.html">cache php</a><span>07-28</span></li><li><a href="http://52shenghuonet.cn/post/1424525.html">php exec報錯</a><span>07-11</span></li><li><a href="http://52shenghuonet.cn/post/1491632.html">php lbi</a><span>08-07</span></li><li><a href="http://52shenghuonet.cn/post/1398830.html">linux用php</a><span>07-26</span></li><li><a href="http://52shenghuonet.cn/post/692702.html">如何使用AJAX技術實現PHP數據提交</a><span>04-22</span></li><li><a href="http://52shenghuonet.cn/post/1735430.html">php 主動websocket</a><span>10-17</span></li><li><a href="http://52shenghuonet.cn/post/1364591.html">= php含義</a><span>07-19</span></li><li><a href="http://52shenghuonet.cn/post/1736339.html">php 代碼檢查工具</a><span>10-16</span></li><li><a href="http://52shenghuonet.cn/post/1405650.html">php aes加密</a><span>07-22</span></li><li><a href="http://52shenghuonet.cn/post/1405633.html">php =無效</a><span>07-22</span></li><li><a href="http://52shenghuonet.cn/post/1329470.html">dede 中直接編寫php文件夾</a><span>07-04</span></li><li><a href="http://52shenghuonet.cn/post/1400229.html">mac電腦配置php</a><span>07-25</span></li></ul></div></div></div></div><div class="fhnfnbr" id="footer"><div id="zn7x5df" class="copyright"><div id="5r77frh" class="container"><p>老白網絡 (http://52shenghuonet.cn/) 前端 后端 zblog主題.<a href="http://52shenghuonet.cn/sitemap/post.html">網站地圖</a><a href="http://52shenghuonet.cn/sitemap/post.xml">xml</a></p><span>Powered By Z-BlogPHP</span></div></div></div><div id="rtzvffv" class="bottom_tools"><a id="scrollUp" href="javascript:;" title="返回頂部"><i class="fa fa-angle-up"></i></a></div><script type="text/javascript" src="http://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script><script src="http://cdn.yzktw.com.cn/zb_users/theme/ydproduct/script/ads.js" type="text/javascript"></script><script src="http://cdn.yzktw.com.cn/zb_users/theme/ydproduct/script/common.min.js" type="text/javascript"></script><script src="http://cdn.staticfile.org/prettify/r298/prettify.min.js" type="text/javascript"></script><script>jQuery(window).load(function(){jQuery("pre").addClass("prettyprint");prettyPrint();});</script><div class="vrnxptv" id="ly_cache" data-id="1604356"></div>
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首先，我們來看看 PHP 中 title 的定義：
php <?php $title = "這是一個標題"; ?>
定義title很簡單，直接使用變量即可。但是在實際應用中，為什么 PHP 中 title 很少被使用呢？
舉個例子，假設我們要編寫一個網站的頭部，通常會涉及到一些全局變量、CSS 樣式、JavaScript等等。可以使用如下代碼定義一個簡單頭部：
php <?php $title = "這是一個標題"; ?> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title><?php echo $title; ?></title> <link rel="stylesheet" href="style.css"> <script src="javascript.js"></script> </head> <body>
這段代碼看上去很簡單，只是在網頁頭部插入一個