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I've found this one surprisingly unreliable when going through all the available methods.
I'll start with the one that worked reliably for my website:
$current_url = home_url($_SERVER['REQUEST_URI']);
Now some will complain about using the "REQUEST_URI" option, so here some alternatives that proved to be not always reliable, depending on your circumstances.
// Option 1 // requires $wp, may not work with permalinks set to plain global $wp; $current_url = home_url( $wp->request ); // Option 2 // requires $wp, may not work with permalinks set to plain global $wp; $current_url = add_query_arg( $wp->query_vars, home_url( $wp->request ) ); // Some other options that may be helpful: $current_url = get_permalink( get_the_ID() ); // for page $current_url = get_category_link( get_query_var( 'cat' ) ); // for category
