url rewriting on custom post type

Question

Is it possible to rewrite this kind of action url on all the posts of a custom post type?

Original url:

example.com/custompostype/post-title/?action=play-123

(Desired Output) Rewriting to:

example.com/custompostype/post-title/play-123

123 = postid

Is it possible to do it with wordpress's functions instead of direct .htaccess edit?

Answer 1

I just realized i used different kind of rewriting which didn't require @Jacob's codes (using add_rewrite_endpoint)

add_action('init', 'wpse42279_add_endpoints');
function wpse42279_add_endpoints()
{
    add_rewrite_endpoint('play', EP_PERMALINK);
}

And then i used this conditionals on the single page:

global $post;
$pid = $post->ID;
$var = get_query_var( 'play' ); 
if( !empty($var) and $var == $pid) :
// do stuff
endif;

Now here's the working pretty link:

example.com/custompostype/post-title/play/123/

Instead of: example.com/custompostype/post-title/?play=123

However the problem now is that the old url still exist (example.com/custompostype/post-title/?play=123) and still accessible/visible. Is it possible to make it work like how this code works:

example.com/?custompostype=321

(It redirects to the pretty link: example.com/custompostype/post-title/)

Answer 2

I'm pretty sure if you need to use the action parameter you will have some mixed results, as this is one WordPress uses under the hood for a lot of things. If you have flexibility over the name of the parameter, this is indeed possible. I am unable to test this at the moment but this should get you headed in the right direction.

function wpse_cpt_rewrite_rule() {
    add_rewrite_rule('^customposttype/([^/]*)/([^/]*)/?','index.php?pagename=$matches[1]&action=$matches[2]','top');
}
add_action('init', 'wpse_cpt_rewrite_rule', 10, 0);

It should be noted that if you don't use the action parameter, you'll need to register your custom param like so as well.

function wpse_add_custom_tag() {
    add_rewrite_tag('%my_custom_action%', '([^&]+)');
}
add_action('init', 'wpse_add_custom_tag', 10, 0);

Answer 3

Assuming that you have the page (new URL) already functional, use this:

$current_url="//".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

if(strpos($current_url, '?action=')) {
    $action = $_GET['action'];
    wp_redirect( 'example.com/custompostype/post-title/' . $action, $status = 301 );
    exit;
}