ow to change cutsom page url of wordpress site using htaccess

At first, you shouldn’t use .htaccess directly when working with WordPress. WordPress has powerful rewrite API allowing you to do the stuff from plugins or theme’s functions.php

If you need the id=floos on more than one page, consider using rewrite endpoints:

function makeplugins_add_json_endpoint() {
    add_rewrite_endpoint( 'floos', EP_PAGES );
}
add_action( 'init', 'makeplugins_add_json_endpoint' );

To determinate, whether floos is set up, you check like this:

global $wp_query
if ( is_page() && isset( $wp_query->query_vars['json'] )  ) { ... }

If you need that only for a specific page and the “id” value can change, you’ll have to use standard wp_rewrite stuff:

add_filter( 'query_vars', 'binda_query_vars' );
function binda_query_vars( $vars ) {
    $vars[] = 'id';
    return $vars;
}

add_action( 'generate_rewrite_rules', 'binda_rewrite_rules' );
function binda_rewrite_rules( $wp_rewrite )
{
    $page = get_post( array( 'post_type' => 'page', 'name' => 'steder-detail' );
    $wp_rewrite->rules = array(
        'steder-detail/(.*)/?$' => $wp_rewrite->index . 'page_id=' . $page->ID . '&id=' . $wp_rewrite->preg_index( 1 ),
    ) + $wp_rewrite->rules;
}

The value of ID would be accessible as follows:

get_query_var( 'ID' );

PS: Both codes should go either to functions.php, or better to site-specific plugin.

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