How to pass a PHP variable using the URL

I want to pass some PHP variables using the URL.

I tried the following code:

link.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". Why?

Solution 1:

In your link.php your echo statement must be like this:

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.

You can directly compare it to a string like this:

if($_GET['link'] == 'Link1')

Another way is to initialize the variable first to the same thing you did with link.php. 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. You can also include this in a session.

Solution 2:

You're passing link=$a and link=$b in the hrefs for A and B, respectively. They are treated as strings, not variables. The following should fix that for you:

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. I would suggest making a common variable file and include it on all necessary pages.

How to pass a PHP variable using the URL

Solution 1:

Solution 2:

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