使用PHP在HREF标记上附加GET参数

Question

I'm working on a code like this:

<?php
$id=$_POST['id'];
$url_tag = $_POST['url_tag'];
$url_back = 'https://www.page.example.com/page.php?';
$query='id='.$id.'&url_tag='.$url_tag;
$url = $url_back.$query;
echo 'Look how this url shows up: '.$url;
echo '<a href='.$url.'>Click here</a>';
?>

This is, the page receives two POST parameters. Then prepare a link to https://www.page.example.com/page.php? and I append those two parameters as GET parameters with the ids id and url_tag respectively.

Then I display how the whole link looks like. It shows up correctly, in this case https://www.page.example.com/page.php?id=ID&url_tag=URL_TAG , where ID and URL_TAG are the actual values received as POST parameters.

However, when I click on the ' Click here ' link, it redirects me to https://www.page.example.com/page.php? , which is the url without any GET parameter.

Why is that happening and how would I solve it? I've tried to feed HREF with urlencode($url) instead, but it redirects me to an address flooded with undesired characters...

Any idea? Thank you!

Answer 1

Try to replace the last line of your code by this:

echo '<a href="'.$url.'">Click here</a>';

It should work.

Answer 2

Try using http_build_query() , it takes care of any URL character compatibility issues for you...

// assuming you've already checked and validated your $_POST parameters
$query = http_build_query(array(
    'id'      => $_POST['id'],
    'url_tag' => $_POST['url_tag']
));
$url = 'https://www.page.example.com/page.php?' . $query;
?>

<a href="<?= $url ?>">Click here</a>