http_build_query without value on parameters (null value)

Question

The PHP function http_build_query is quite handy for building an URL with GET parameters. But sometimes I like to use value-less "boolean" parameters, like so:

/mypage?subscription-id=42&cancel-renewal

Which I then check with a simple isset. Can I achieve this result with http_build_query?

EDIT: Assigning empty values to the parameter does not seem to work :

cancel-renewal => '' results in cancel-renewal=
cancel-renewal => null results in the parameter being omitted
cancel-renewal => false results in cancel-renewal=0

http_build_query save data in variables in the form of associative array and then pass that as a parameters. While in get request you need to write a parameters in url. You may assign the empty value to that key. — NomanJaved
– NomanJaved, Commented Mar 21, 2019 at 14:47
I guess by doing $query['cancel-renewal'] = "";. I'm not sure.. — Aaron Jonk
– Aaron Jonk, Commented Mar 21, 2019 at 14:48
Why does that matter, it's never seen anywhere. cancel-renewal is the same as cancel-renewal= — Barmar
– Barmar, Commented Mar 21, 2019 at 15:08
You'll have to write your own replacement function, I don't think there's any way to make the built-in function do what you want. — Barmar
– Barmar, Commented Mar 21, 2019 at 15:12

Nik · Accepted Answer · 2019-03-21 17:37:33Z

3

Can I achieve this result with http_build_query?

No. Internally http_build_query appends the = key-value separator no matter what is the value of the parameter. You can see the source code here (PHP 7.3.3)

Means you either need to accept the cancel-renewal= look of the parameter or may be redesign the path to have something like /mypage/cancel-renewal?subscription-id=42

Third option would be to write your own simple function to build the query string.

answered Mar 21, 2019 at 17:37

Nik

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Aaron Jonk · Accepted Answer · 2019-03-21 15:17:17Z

0

Use this;

$query = array("subscription-id" => 42, "cancel-renewal" => "");
$http_query = http_build_query($query);

This will return ?subscription-id=42&cancel-renewal=. And works perfectly fine with isset()

answered Mar 21, 2019 at 15:17

Aaron Jonk

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