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The simplest and quickest solution would be to use the add_rewrite_endpoint function. <?php add_rewrite_endpoint( $name, $places ); ?> So in your case it would be something like this: add_rewrite_endpoint( 'user', EP_PERMALINK | EP_PAGES ); An user URL would look like this: http://www.example.com/my-page/user/john To access the variable: ...
Exist some WordPress function that retrieve the list of links (in my specific case only one) that are into a post? Check out the core wp_extract_urls() function: $urls = wp_extract_urls( $content ); that will extract urls from any given content. Example $content = 'Two test sites: <a href="http://foo.tld">Foo.tld</a> and ...
When adding an external link you need to include HTTP:// or HTTPS:// at the start of the URL to link to an external domain. Otherwise the link will be added onto the current domain.
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