How to check if ANY php parameter exists in url

Question

I am making a forum that accesses threads based off the category in the URL using the GET method. I want to redirect to an error page if no parameters exist in the url, but I want this to be a generic piece of code that can be used around my whole site.

For example:

The url would normally contain the category id:

localhost/myforum/threads.php?categoryid=1

I want it so that when the url is:

localhost/myforum/threads.php

it is to redirect to an error page, and that this piece of code is usable all around the website

There is the answer in your question. Check $_GET array, or http://php.net/manual/en/function.parse-url.php. — Peter, Apr 24 '17 at 01:34

score 7 · Answer 1 · answered Apr 24 '17 at 02:28

7

The most reliable way is to check if the URL contains a question mark:

if (false !== strpos($_SERVER['REQUEST_URI'], '?')) {
    // There is a query string (including cases when it's empty)
}

answered Apr 24 '17 at 02:28

Marat Tanalin

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score 2 · Answer 2 · edited Apr 24 '17 at 06:56

2

Try:

$gets = parse_url($url));
if($gets['query'] == "")
{
    echo "No GET variables";
}

edited Apr 24 '17 at 06:56

Aurasphere

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answered Apr 24 '17 at 01:44

Ali Rasheed

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score 1 · Answer 3 · 2017-04-24T02:59:43.457

1

Just:

if (empty(array_diff($_GET, ['']))) {
    header("Location: /path/to/error.php");
}

EDIT: Updated to remove empty values

edited Apr 24 '17 at 02:59

answered Apr 24 '17 at 01:38

please add a closing parenthesis after the empty call to close the if condition. – Paul T. Apr 24 '17 at 01:51
@TurboPT Missed that, thanks. – Apr 24 '17 at 01:52
@PedroLobito It returns true. – Apr 24 '17 at 03:09
@PedroLobito True as well, as it's suppose to. What point are you trying to make? – Apr 24 '17 at 03:12
I'll give 1+ for the simplicity, well done, I've corrected my answer. – Pedro Lobito Apr 24 '17 at 03:12

LF00 · Answer 4 · 2017-04-24T02:11:10.023

0

You can use is_set to check if the parameter exists like this,

isset($_GET)

edited Apr 24 '17 at 02:11

answered Apr 24 '17 at 01:51

LF00

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1

`isset` not `is_set` and this will only check for a parameter called categoryid, not others. – Apr 24 '17 at 01:54

How to check if ANY php parameter exists in url

4 Answers4