在 HTML 标签内使用 PHP 变量？
[英]Using PHP variables inside HTML tags?
问题描述
I am pretty new to php but I'm stuck on this problem... Say i wait to put a link to another site with a given parameter, how do I do it correclty?
我对 php 很陌生，但我被困在这个问题上......假设我等待使用给定参数放置另一个站点的链接，我该怎么做？
This is what i have now:这就是我现在拥有的：
<html>
<body>
<?php
$param = "test";
echo "<a href="http://www.whatever.com/$param">Click Here</a>;
?>
</body>
</html>
7 个解决方案
解决方案1
33 已采纳 2011-05-25 20:37:58
Well, for starters, you might not wanna overuse echo, because (as is the problem in your case) you can very easily make mistakes on quotation marks.好吧，对于初学者来说，您可能不想过度使用回声，因为（就像您的问题一样）您很容易在引号上出错。
This would fix your problem:这将解决您的问题：
echo "<a href=\"http://www.whatever.com/$param\">Click Here</a>";
but you should really do this但你真的应该这样做
<?php
$param = "test";
?>
<a href="http://www.whatever.com/<?php echo $param; ?>">Click Here</a>
解决方案2
15 2011-05-25 20:40:42
You can do it a number of ways, depending on the type of quotes you use:您可以通过多种方式执行此操作，具体取决于您使用的引号类型：
-
echo "<a href='http://www.whatever.com/$param'>Click here</a>"; -
echo "<a href='http://www.whatever.com/{$param}'>Click here</a>"; -
echo '<a href="http://www.whatever.com/'. $param. '">Click here</a>'; -
echo "<a href=\"http://www.whatever.com/$param\">Click here</a>";
Double quotes allow for variables in the middle of the string, where as single quotes are string literals and, as such, interpret everything as a string of characters -- nothing more -- not even \n will be expanded to mean the new line character, it will just be the characters \ and n in sequence.双引号允许字符串中间的变量，其中单引号是字符串文字，因此，将所有内容解释为字符串 - 仅此而已 - 甚至\n都不会被扩展为表示换行符, 它只是字符\和n的顺序。
You need to be careful about your use of whichever type of quoting you decide.您需要小心使用您决定的任何类型的引用。 You can't use double quotes inside a double quoted string (as in your example) as you'll be ending the string early, which isn't what you want.您不能在双引号字符串中使用双引号（如您的示例中所示），因为您将提前结束字符串，这不是您想要的。 You can escape the inner double quotes, however, by adding a backslash.但是，您可以通过添加反斜杠来转义内部双引号。
On a separate note, you might need to be careful about XSS attacks when printing unsafe variables (populated by the user) out to the browser.另外，在将不安全变量（由用户填充）打印到浏览器时，您可能需要小心XSS攻击。
解决方案3
10 2013-11-20 17:20:22
There's a shorthand-type way to do this that I have been using recently.我最近一直在使用一种速记类型的方法来执行此操作。 This might need to be configured, but it should work in most mainline PHP installations.这可能需要配置，但它应该适用于大多数主线 PHP 安装。 If you're storing the link in a PHP variable, you can do it in the following manner based off the OP:如果您将链接存储在 PHP 变量中，您可以根据 OP 以下列方式执行此操作：
<html>
<body>
<?php
$link = "http://www.google.com";
?>
<a href="<?= $link ?>">Click here to go to Google.</a>
</body>
</html>
This will evaluate the variable as a string, in essence shorthand for echo $link;这会将变量评估为字符串，本质上是 echo $link; 的简写；
解决方案4
4 2011-05-25 20:46:25
I recommend using the short ' instead of ". If you do so, you wont longer have to escape the double quote (\").我建议使用简短的 ' 而不是 "。如果这样做，您将不再需要转义双引号 (\")。
In that case you would write在那种情况下，你会写
echo '<a href="http://www.whatever.com/'. $param .'">Click Here</a>';
But look onto nicolaas' answer "what you really should do" to learn how to produce cleaner code.但是看看 nicolaas 的回答“你真正应该做什么”来学习如何生成更清晰的代码。
解决方案5
1 2011-05-25 20:39:13
You can embed a variable into a double quoted string like my first example, or you can use concantenation(the period) like in my second example:您可以像我的第一个示例一样将变量嵌入到双引号字符串中，或者您可以像我的第二个示例中那样使用串联（句点）：
echo "<a href=\"http://www.whatever.com/$param\">Click Here</a>";
echo '<a href="http://www.whatever.com/'. $param. '">Click Here</a>';
Notice that I escaped the double quotes inside my first example using a backslash.请注意，我在第一个示例中使用反斜杠转义了双引号。
解决方案6
1 2011-05-25 20:40:48
HI Jasper,嗨贾斯珀，
you can do this:你可以这样做：
<?
sprintf("<a href=\"http://www.whatever.com/%s\">Click Here</a>", $param);
?>
解决方案7
0 2011-05-25 20:40:30
Heredoc may be an option, see example 2 here: http://php.net/manual/en/language.types.string.php Heredoc 可能是一个选项，请参见此处的示例 2： http://php.net/manual/en/language.types.string.php
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