php remove QUERY_STRING variable

Question

i have this function that should remove part of a query string:

if(!function_exists("remove_querystring_var")) {
    function remove_querystring_var($url, $key) {
        $url = preg_replace('/(.*)(?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&');
        $url = substr($url, 0, -1);
        return ($url);
    }
}

i have ahref links like:

<a href="link.php?<?php echo $_SERVER["QUERY_STRING"]; ?>">link</a>

but i need to be able to remove ?pagenum=X (X = a page number)

So does your remove_querystring_var function work? Not work? What's the question here? — gen_Eric
– gen_Eric, Commented Dec 8, 2014 at 22:29
Btw, if(!function_exists("remove_querystring_var")) { looks like fixing consequences not the roots. — zerkms
– zerkms, Commented Dec 8, 2014 at 22:29
Does $url = preg_replace('?pagenum=X', ''); not work or is that not what you needed to do? — Mr. Concolato
– Mr. Concolato, Commented Dec 8, 2014 at 22:33

andrew · Accepted Answer · 2014-12-08 22:59:38Z

3

you could just

unset($_GET['pagenum']);

and

<a href="link.php?<?= http_build_query($_GET) ?>">link</a>

Code would potentially look like:

<?php

// $_GET looks like: array('foo'=>'bar','pagenum'=>5,'abc'=>'xyz')

unset($_GET['pagenum']);

// now $_GET looks like: array('foo'=>'bar','abc'=>'xyz')

// so http_build_query($_GET) will look like: foo=bar&abc=xyz
?>


<a href="link.php?<?php echo http_build_query($_GET) ?>">link</a>

edited Dec 8, 2014 at 22:59

answered Dec 8, 2014 at 22:37

andrew

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2 Comments

user3815283 Over a year ago

how do i use unset in a href link ?

andrew Over a year ago

you don't, you unset the GET variable before building a new query string, ill edit the answer to make it more clear

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