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Assuming I have this URL:

http://site.com/?get=something

How can I change it to a nice URL that looks like:

http://site.com/get_something

using WP's URL rewriting system?

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up vote 1 down vote accepted

First add get to query vars array:

function add_query_vars_wpa12572($vars) {
    $vars[] = 'get'
    return $vars;
}

add_filter('query_vars', 'add_query_vars_wp12572');

then add the rewrite rule

function author_rewrite_rules_wpa12572( $wp_rewrite ) {
  $newrules = array();
  $new_rules['get_(\d*)$'] = 'index.php?get=$matches[1]';
  $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}
add_filter('generate_rewrite_rules','author_rewrite_rules_wpa12572');
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