adding variables to search

if i have a line such as:

HTML Code:

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http://www.site.net/index.php?s=1

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in my browser and i want to be able to click on another link in my website and end up with:

HTML Code:

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http://www.site.net/index.php?s=1&t=2

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what is the correct method to do this via an anchor tag?

i tried:

PHP Code:

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<?php echo $PHP_SELF;?>?t=<?php echo $tnum;?>">

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but as you will know that only returned:

HTML Code:

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http://www.site.net/index.php?t=2

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so what is the correct way? (without using cookies if possible)

many thanks for your help,

Im not sure what you asking, but here is how you add another variable:

PHP Code:

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<?php echo $PHP_SELF; ?>?t=<?php echo $tnum; ?>&amp;s=<?php echo $snum; ?>

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what i mean is that

if my url is:

Quote:

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http://www.site.net/index.php?s=1

---

this:

Quote:

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<?php echo $PHP_SELF; ?>

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still = http://www.site.net/index.php

ie.

Quote:

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<?php echo $PHP_SELF;?>?t=<?php echo $tnum;?>">

---

will just do:

Quote:

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http://www.site.net/index.php + $t

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but i want to add $t onto whatever the url is (and keep any other variables already there intact)

hope that makes sense,

Use the $_SERVER['QUERY_STRING'] variable.

Validate all variables in $_GET and then use the results to generate a new query string for the hyperlink.