如何使用 URL 传递 PHP 变量
[英]How to pass a PHP variable using the URL
问题描述
I want to pass some PHP variables using the URL.
我想使用 URL 传递一些 PHP 变量。
I tried the following code:我尝试了以下代码：
link.php链接.php
<html>
<body>
<?php
$a='Link1';
$b='Link2';
echo '<a href="pass.php?link=$a">Link 1</a>';
echo '<br/>';
echo '<a href="pass.php?link=$b">Link 2</a>';
?></body></html>`</pre></code>
pass.php
<pre><code>`<html>
<body>
<?php
if ($_GET['link']==$a)
{
echo "Link 1 Clicked";
} else {
echo "Link 2 Clicked";
}
?></body></html>
Upon clicking the links Link1 and Link2 , I get "Link 2 clicked".单击链接Link1和Link2 ，我得到“单击链接 2”。 Why?为什么？
6 个解决方案
解决方案1
27 已采纳 2011-03-26 03:45:28
In your link.php your echo statement must be like this:在您的 link.php 中，您的echo语句必须是这样的：
echo '<a href="pass.php?link=' . $a . '>Link 1</a>';
echo '<a href="pass.php?link=' . $b . '">Link 2</a>';
Then in your pass.php you cannot use $a because it was not initialized with your intended string value.然后在你的 pass.php 中你不能使用$a因为它没有用你想要的字符串值初始化。
You can directly compare it to a string like this:您可以直接将其与这样的字符串进行比较：
if($_GET['link'] == 'Link1')
Another way is to initialize the variable first to the same thing you did with link.php.另一种方法是首先将变量初始化为您对 link.php 所做的相同的事情。 And, a much better way is to include the $a and $b variables in a single PHP file, then include that in all pages where you are going to use those variables as Tim Cooper mention on his post.而且，更好的方法是将$a和$b变量包含在单个 PHP 文件中，然后将其包含在您将使用这些变量的所有页面中，正如 Tim Cooper 在他的帖子中提到的那样。 You can also include this in a session.您也可以将其包含在会话中。
解决方案2
6 2011-03-26 03:32:53
You're passing link=$a and link=$b in the hrefs for A and B, respectively.您分别在 A 和 B 的 href 中传递link=$a和link=$b 。 They are treated as strings, not variables.它们被视为字符串，而不是变量。 The following should fix that for you:以下应该为您解决这个问题：
echo '<a href="pass.php?link=' . $a . '">Link 1</a>';
// and
echo '<a href="pass.php?link=' . $b . '">Link 2</a>';
The value of $a also isn't included on pass.php . $a的值也不包含在pass.php 。 I would suggest making a common variable file and include it on all necessary pages.我建议制作一个通用变量文件并将其包含在所有必要的页面上。
解决方案3
2 2018-06-21 14:08:37
All the above answers are correct, but I noticed something very important.以上所有答案都是正确的，但我注意到一些非常重要的事情。 Leaving a space between the variable and the equal sign might result in a problem.在变量和等号之间留一个空格可能会导致问题。 For example, (?variablename =value)例如， (?variablename =value)
解决方案4
1 2013-09-05 00:08:26
I found this solution in " Super useful bits of PHP, Form and JavaScript code " at Skytopia.我在 Skytopia 的“ PHP、表单和 JavaScript 代码的超级有用部分”中找到了这个解决方案。
Inside "page1.php" or "page1.html":在“page1.php”或“page1.html”中：
// Send the variables myNumber=1 and myFruit="orange" to the new PHP page...
<a href="page2c.php?myNumber=1&myFruit=orange">Send variables via URL!</a>
//or as I needed it.
<a href='page2c.php?myNumber={$row[0]}&myFruit={$row[1]}'>Send variables</a>
Inside "page2c.php":在“page2c.php”里面：
<?php
// Retrieve the URL variables (using PHP).
$num = $_GET['myNumber'];
$fruit = $_GET['myFruit'];
echo "Number: ".$num." Fruit: ".$fruit;
?>
解决方案5
1 2014-03-26 15:39:25
Use this easy method使用这个简单的方法
$a='Link1';
$b='Link2';
echo "<a href=\"pass.php?link=$a\">Link 1</a>";
echo '<br/>';
echo "<a href=\"pass.php?link=$b\">Link 2</a>";
解决方案6
0 2018-09-30 12:12:58
just put就放
$a='Link1';
$b='Link2';
in your pass.php and you will get your answer and do a double quotation in your link.php:在你的 pass.php 中，你会得到你的答案并在你的 link.php 中做一个双引号：
echo '<a href="pass.php?link=' . $a . '">Link 1</a>';
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