我是否需要在html文件中使用！DOCTYPE声明？ [英] Do I need a !DOCTYPE declaration in a php file with html?
问题描述
我有一个包含我的网站内容的php文件。该文件需要.php，因为我先获得一些变量，然后在网站内容中使用它。像这样的例子：
<？php
$ user_name = $ _REQUEST ['username'];
？>
<！DOCTYPE HTML>
< html>
< head>
< meta charset =utf-8>
< title>页面标题< / title>
< link rel =stylesheethref =css / style.css/>
< / head>
< body>
欢迎<？php echo $ username;？>
< / body>
< / html>
我需要<！DOCTYPE HTML> ，因为文件扩展名是php？另外，它是否正确放置？它应该在标签之前还是在我的文件的第一行？
我还注意到，如果我删除<！DOCTYPE HTML> ; ，我的一些css代码停止工作......
非常感谢。
是的，您需要一个DOCTYPE，因为您的浏览器只能看到以上代码的以下部分：
<！DOCTYPE HTML>
< html>
< head>
< meta charset =utf-8>
< title>页面标题< / title>
< link rel =stylesheethref =css / style.css/>
< / head>
< body>
欢迎使用者名称
< / body>
< / html>
我通常将关闭PHP标签和DOCTYPE放在一起，就像？> ;<！DOCTYPE HTML>
I have a php file with my website content in it. The file needs to be .php because i get some variables first and then use it later in the website content. Like this example:
<?php
$user_name = $_REQUEST['username'];
?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Page Title</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
Welcome <?php echo $username;?>
</body>
</html>
Do I need the <!DOCTYPE HTML>, since the file extension is php? Also, is it placed corretly? Should it come before the tag or in the very first line of my file?
I also noticed that if I remove the <!DOCTYPE HTML>, some of my css code stops working...
Thank you very much.
Yes you need a DOCTYPE as your browser only sees the following part of the above code
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Page Title</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
Welcome THE USER NAME
</body>
</html>
I usually place the close PHP tag and the DOCTYPE together like so ?><!DOCTYPE HTML>
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