Is it possible to change/update a query string in a URL using PHP?

Question

Is it possible to programatically change the query URL within PHP? I know I can use the $_GET['something'] function to get data from a URL query, but I don't know how to change a query string programatically in PHP.

This is an example of what I want to do:

//---- index.php ----\\    
$variable = 23;

And my URL is: http://example.com/index.php?variable=23

So if I make $variable = 10 later on in the program (not using headers, and not hard-coded into a link), I want to be able to programatically update the query URL, so that my URL will now read:

http://example.com/index.php?variable=10

Is this even possible, without using forms?

Most likely you want first solution proposed by @genesis (header()). However, if that's not what you want, explain what you're trying to accomplish. — lxa
– lxa, Commented Jul 16, 2011 at 19:27
Okay, thanks :) Yeah I think the header() method is the only possible approach I can take. — Titus
– Titus, Commented Jul 16, 2011 at 19:33

genesis · Accepted Answer · 2011-07-16 19:15:28Z

2

header("Location: index.php?variable=10");

or do you mean

$_GET['variable'] = 10;

?

answered Jul 16, 2011 at 19:15

genesis

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4 Comments

Titus Over a year ago

Can I actually set $_GET['variable'] = 10 in PHP? Will that update the query URL? From what I know, that doesn't sound possible.

Titus Over a year ago

By "query URL", I mean: example.com/index.php?variable=10 Sorry for being unclear!

lxa Over a year ago

@Titus make sure to put exit; after header(), because with header() you're effectively "restarting" your script with different query parameters, and therefore want to finish current run.

Marc B Over a year ago

@Titus: the superglobals (_GET/POST/REQUEST/etc...) are basically read only. You can write to those arrays, but the writes won't change the startup-state of the script, and won't affect urls you write later.

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