add_rewrite_rule无法正常工作

<?php
function add_my_external_rules()
{
    add_rewrite_rule('myrule', '/newlocation');
}
add_action('init', 'add_my_external_rules');
?>

Hi i am using this code in function.php file of a theme to add my own rewrite rule in .htaccess file. But this code is not writing any thing in .htaccess file. Please help.

add_rewrite_rule will not write anything in your .htaccess file. Just in the database. If it is not working, go to your Permalink settings in the admin and just click Save (no need to change anything). This flushes the permalinks.