Comments on: PHP Function: Remove a Query String Key=>Value

By: Krrish

Krrish — Mon, 12 Sep 2011 11:07:31 +0000

RegEx are Tough to understand… But they solve our problems in short…
I Use array in such Tasks.

By: Tony

Tony — Tue, 26 Jul 2011 15:40:49 +0000

I took the regex and expanded it. PHP allows array references in the querystring vars such as http://www.example.com/?a=1&a0=3&a5789fddsddd=44

Also, this function allows the removal of multiple vars.

echo htmlentities(getRedirectURL("http://www.example.com/?a[]=1&a[0]=3&a[5][7][89][fdds][ddd]=44","a")); echo htmlentities(getRedirectURL("http://www.example.com/?a=1&a=2&b=3&c=4",array("a","c"))); function getRedirectURL($url,$keysToRemove) { if (!is_array($keysToRemove)) $keysToRemove = array($keysToRemove);

foreach ($keysToRemove as $key) $url = preg_replace('/(?:&|(\\?|\\G))' . urlencode($key) . '(?:\\[[^]]*\\])*=[^&]*(?(1)&|)?/i', "$1", $url);

if (substr($url,-1) == '?') $url = substr($url,0,-1);

return $url; }

By: Adrian Callaghan

Adrian Callaghan — Wed, 13 Apr 2011 09:58:57 +0000

thanks!! lots of cool ways.

I always like a regular expression but an alternative would be to use the ? as a delimiter and explode the uri into an array and retrieve the first result i.e

echo reset(explode(‘?’,$_SERVER['REQUEST_URI']));

By: Charlie

Charlie — Mon, 28 Jun 2010 19:17:25 +0000

I had an array of checkbox values being passed in the querystring, and I don’t think these functions work for removing it.

I found it easier to just directly define the $_SERVER['QUERY_STRING'] by concatenating the $_GET[] variables I wanted to pass, and leaving out the ones I didn’t (the checkbox array)

By: Charlie

Charlie — Mon, 28 Jun 2010 19:16:54 +0000

I had an array of checkbox values being passed in the querystring, and I don’t think these functions work for removing it.

I found it easier to just directly define the $_SERVER['QUERY_STRING'] by concatenating the $_GET[] variables I wanted to pass, and leaving out the ones I didn’t (the checkbox array)

By: Adam

Adam — Wed, 05 May 2010 14:05:56 +0000

@Adam: Oh and just for making it even more condensed, shorten the whole function to this:

function remove_qs_key($url, $key) {
return preg_replace(‘/(?:&|(\?))’ . $key . ‘=[^&]*(?(1)&|)?/i’, “$1″, $url);
}

By: Adam

Adam — Wed, 05 May 2010 14:04:03 +0000

@Dustin Hansen: Dustin’s solution is the most elegant and I found the other solutions to have issues with parameter’s at the beginning and end of the query string – in my testing Dustin’s solution worked for parameters at all positions.

By: Tom Spizuoco

Tom Spizuoco — Sun, 28 Feb 2010 19:57:36 +0000

I like the parse_str/http_query_build idea so I extended it to include the ability to remove an array of values and add an array of values.

function querystring($strQS, $arRemove, $arAdd = NULL)
{
parse_str($strQS, $arQS);
$arQS = array_diff_key($arQS, array_flip($arRemove));
$arQS = $arQS + $arAdd;
return http_build_query($arQS);
}

Example:
Current URL = http://www.example.com?one=1&two=2&three=3&four=4

$arR = array(‘two’, ‘four’);
$arA = array(‘five’ => 5, ‘six’ => 6);
echo querystring($_SERVER['QUERY_STRING'], $arR, $arA);

prints “one=1&three=3&five=5&six=6″

By: Dustin Hansen

Dustin Hansen — Tue, 16 Feb 2010 01:40:15 +0000

Still that entire regex could be reduced to:

preg_replace(‘/(?:&|(\?))’ . $key . ‘=[^&]*(?(1)&|)?/i’, “$1″, $url);

By: Dimitri Uwarov

Dimitri Uwarov — Mon, 15 Feb 2010 20:40:12 +0000

Hi,

nice code, but it did not work for the first parameter, because the “?” should be escaped: “\?” to match.
See here: http://php.net/manual/de/function.preg-replace.php

if i add escape it works for me:

function remove_querystring_var($url, $key) {
$url = preg_replace(‘/(.*)(\?|&)’ . $key . ‘=[^&]+?(&)(.*)/i’, ‘$1$2$4′, $url . ‘&’);
$url = substr($url, 0, -1);
return $url;
}

echo remove_querystring_var(“http://www.thinkplexx.com/?errors=%0A%09The+password+field+is+empty.%3B”,”errors”);