PHP using $_GET to get a URL with variables in it

Question

I'm using PHP $_GET to get a URL from a URL variable like so:

echo 'URL: ' . $_GET['url'];

When I get a regular URL it echos fine, for example:

http://localhost?url=http://google.com

The output is:

URL: http://google.com

But if the URL contains multiple variables, they get cut off, for example:

http://localhost?url=http://google.com?id1=55&id2=88&id3=99

Will return:

URL: http://google.com?id1=55

If there any way around this so I can get the URL regardless of what it contains? e.g. so it returns:

URL: http://google.com?id1=55&id2=88&id3=99

Updated, in response to Yuu:

$url = $_GET['url'];
$parse = parse_url($url);

$replace_old = array($parse['host'],'http://');
$replace_new = array("","");

$url_vars = str_replace($replace_old,$replace_new,$url);

echo $parse['host'] . htmlentities($url_vars);

isopach · Accepted Answer · 2019-12-05 06:45:00Z

1

You have to urlencode your URL, in order to parse the special characters.

<?php
$query_string = 'foo=' . urlencode($foo) . '&bar=' . urlencode($bar);
echo '<a href="http://google.com?' . htmlentities($query_string) . '">';
?>

https://www.php.net/manual/en/function.urlencode.php

Edit as response to edit:

This would work. You needed to encode the & right at the GET stage.

<?php

$url = $_GET['url'];
unset($_GET['url']);
if ($_GET) {
    $url .= '&' . http_build_query($_GET);
}
$parse = parse_url($url);


$replace_old = array($parse['host'],'http://');
$replace_new = array("","");

$url_vars = str_replace($replace_old,$replace_new,$url);


echo $parse['host'] . $url_vars;


?>

edited Dec 5, 2019 at 6:45

answered Dec 5, 2019 at 3:33

isopach

1,9487 gold badges33 silver badges46 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

The Bobster Over a year ago

Thanks for the response, but as far as I can see, this unfortunately does not work when the URL is retrieved from a URL using $_GET, because the other variables cannot be retrieved from the URL at all (see code posted above)

isopach Over a year ago

@TheBobster You need to urlencode the & symbol to %26. It should work with that.

isopach Over a year ago

@TheBobster I have edited my answer with the code, please check if it works now.

JJJJ · Accepted Answer · 2019-12-05 05:15:04Z

0

You need to urlencode first the url value before passing it.

Example:

echo urlencode('http://google.com?id1=55&id2=88&id3=99');

Output:

http%3A%2F%2Fgoogle.com%3Fid1%3D55%26id2%3D88%26id3%3D99

And in your URL

http://localhost?url=http%3A%2F%2Fgoogle.com%3Fid1%3D55%26id2%3D88%26id3%3D99

answered Dec 5, 2019 at 5:15

JJJJ

1,3682 gold badges9 silver badges25 bronze badges

Collectives™ on Stack Overflow

PHP using $_GET to get a URL with variables in it

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related