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I have a URL as a string in $url.

I want to replace a specific parameter (if it exists) in the URL.

For example

$url = "http://www.xxx.xxx?data=1234324&id=abc&user=walter";

I'd like check if id exists and if it does, I want to replace the value of that id to a specific value. But the value of the id isn't always the same and it's not always in the same place.

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  • parse_url to get the query string ("get" string), parse_str to parse it to an array. Check if the value isset and change it then http_build_query to change the array back into a query string and then append it after the ?. Commented Aug 29, 2016 at 20:32

1 Answer 1

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You can extract your query with PHP's parse_url function:

$b = parse_url($url, PHP_URL_QUERY);

From here you can use parse_str to get an associative array:

parse_str($b, $arr);

Now you can access the parameters

$arr['data'];
$arr['id'];
$arr['user'];

If you want to check if the id parameter exists you can use

if (isset($arr['id'])) {
//Do something
}
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and can you explain how i get the $url with the replaced id? and how i replace the array id? :D sorry im new in arrays ( and PHP ;) for example i want to replace the value of the id from "abc" to "xyz"

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