Question

i have a question about formatting the URL parameters in php

page 1 can have these 2 url

http://somewhere.com/page1.php?foo=1
and
http://somewhere.com/page1.php

now on page 1, when i click a button, i want it to redirect to its self but with an additional parameters in the URL like so

http://somewhere.com/page1.php?foo=1&bar=2
or
http://somewhere.com/page1.php?bar=2

depending on the current url. How can i do this in php?

thanks,
Vidhu

Answer 1

First, check if a certain $_GET parameter is set, using isset.
If it is, echo a certain link. If not, echo a different link.

if( !isset($_GET['bar']) ){
    echo '<a href="?bar=2">link</a>';
}
else{
    echo '<a href="page1.php">link</a>';
}