PHP Function: Remove a Query String Key=>Value

18 Jan 2010

I was recently coding a website which relied heavily on query string variables. It was absolutely imperative that I keep the query string clean and not duplicate keys. I needed to find a PHP function that would allow me to remove keys (and their values) easily and reliably. Enter a PHP function I found at Added Bytes:

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

/* usage */
//pretending this page is

All I needed to do was provide the URL (in my case I wanted the current page’s URI) and the key to remove — so simple!

All credit goes to Added Bytes for their awesome work. It saved me a lot of time…hopefully it does for you too!

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PHP Function: Remove a Query String Key=>Value

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Tags: David Walsh Blog, Don, duplicate keys, function, gt value, microsoft sql server, nbsp, php, php query string, query, string variables, URI, URL

4 Responses to PHP Function: Remove a Query String Key=>Value

Joe

March 17th, 2010 at 4:10 am

okey you got a few things mixed up there.

so, php is used to generate dynamic content, not to design the site.

IFrames are bad and evil. If u use them too much they'll take over the internet and kill us all. Do not use them.

div's your friend. use them for a general structure and then work with css to style them. Divs are friendly.

btw: Tables are also evil. Only use them to display data that needs to be in a table.

Lance #1 Davis

March 19th, 2010 at 7:14 am

Trial and error:
|2x-1|>3
|2(5)-1|>3 = |10-1|>3 = |9|>3 =9>3 = True
|2(3)-1|>3 = |6-1|>3 = |5|>3 =5>3 = True
|2(-1)-1|>3 = |-2-1|>3 = |-3|>3 =3>3 = False
|2(-4)-1|>3 = |7-1|>3 = |6|>3 =6>3 = True
|2(10)-1|>3 = |20-1|>3 = |19|>3 =19>3 = True

Thus C (-1) is your answer

Rafe

March 24th, 2010 at 1:36 pm

it probably comes (somehow) from an html email and dropped the actual code that makes it work.

& nbsp; in html is a non breaking space. In other words a normal space.

It is usually used when someone wants more than one space between words/things as a web browser (or email client viewing html email) will condense more than one empty space into just one of them.

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PHP Function: Remove a Query String Key=>Value

4 Responses to PHP Function: Remove a Query String Key=>Value

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