Wp Login redirect strips parameters from url

Question

If i write http://domain.com/wp-login.php?redirect_to=http://domain.com/specificpage/?parameter1=dog&parameter2=dog&parameter3=cat in the url address bar (to make the login page redirect to a specific page with parameters) and login.

I get redirected to the right page but only with first parameter (http://domain.com/specificpage/?parameter1=dog). the other two parameters are stripped from the url.

How can i solve that?

Btw - the parameters are acceptable on this site (set in the functions file with add_custom_query_vars so that's not the problem).

Answer 1

I think you should encode the & to avoid potential conflicts:

http://domain.com/wp-login.php?redirect_to=http://domain.com/specificpage/?parameter1=dog&parameter2=dog&parameter3=cat

Answer 2

Option 1: Using wp_login_url($redirect):

wp_login_url takes an argument $redirect that will correctly generate the redirect_to query parameter correctly encoded:

echo '<a href="' . esc_attr( wp_login_url( "http://domain.com/specificpage/?parameter1=dog&parameter2=dog&parameter3=cat" ) ) . '">test</a>';

This would print:

<a href="http://example.com/wp-login.php?redirect_to=http%3A%2F%2Fdomain.com%2Fspecificpage%2F%3Fparameter1%3Ddog%26parameter2%3Ddog%26parameter3%3Dcat">test</a>

As you can, special characters like ? and & get encoded using percent encoding to %3F and %26 respectively (not an HTML entity like & as another answer suggested).

Option 2: Using http_build_query:

If you didn't want to use wp_login_url but a more a general tool that applies to search queries in general, you can use PHP's http_build_query instead, like this:

echo '<a href="http://example.com/wp-login.php?' . esc_attr( http_build_query(['redirect_to' => 'http://domain.com/specificpage/?parameter1=dog&parameter2=dog&parameter3=cat']) ) . '">test</a>';

This would print:

<a href="http://example.com/wp-login.php?redirect_to=http%3A%2F%2Fdomain.com%2Fspecificpage%2F%3Fparameter1%3Ddog%26parameter2%3Ddog%26parameter3%3Dcat">test</a>