问如何将php变量正确传递给ajax调用？

EN

function ccss_show_tag_recipes() {

global $post;
global $wp;

$html = '';

$url = home_url( $wp->request );
$path = parse_url($url, PHP_URL_PATH);
$pathFragments = explode('/', $path);
$currentPage = end($pathFragments); //I WANT TO PASS THIS TO MY JS FILE


$term_tags = get_terms('cp_recipe_tags'); 
$term_cats = get_terms('cp_recipe_category');

$recipetype = array();
$recipecat = array();

foreach($term_tags as $term) {
    $recipetype[] = $term->slug;
}

foreach($term_cats as $term) {
    $recipecat[] = $term->slug;
}


if ( in_array( $currentPage , $recipecat  ) ) {

        $html = ccss_load_phases($html,$currentPage);

    }

}

function ccss_load_phases($html = '',$currentPage){
     //CODE HERE etc

    $html .= '<div id="btn-wrapper-'.$termid.'" class="btn-wrapper"><a id="'.$termid.'" class="load-more-btn" href="#">Load more recipes</a></div>';    

}

(function($) {
    $(document).on( 'click', 'a.load-more-btn', function( event ) {


    var a = $(this).attr('id'); // I CAN ONLY GET THE ID SINCE IT WAS TRIGGERED BY BUTTON CLICK, how to include $currentPage?

    var button = $(this),
            data = {
            'action': 'ajax_loadmore',
            'termID': a
        };



    event.preventDefault();

        $.ajax({
            url: ajaxloadmore.ajaxurl,
            data: data, 
            type: 'post',
            beforeSend : function () {
                button.text('Loading...'); // change the button text, you can also add a preloader image
            },
            success: function( result ) {

                 //console.log(data.post_gallery_imgs);

                $('#cooked-recipe-list-'+a+' ').append(result).fadeIn();
                c
                //alert( result );
            },

            complete: function() {
                button.remove(); // if no data, remove the button as well
                //$('body').find('a#'+a+'').remove();
            }
        })
    })

})(jQuery);

add_action( 'wp_ajax_nopriv_ajax_loadmore', 'my_ajax_loadmore' );
add_action( 'wp_ajax_ajax_loadmore', 'my_ajax_loadmore' );

function my_ajax_loadmore() {


    $termID = $_POST['termID']; //ONLY THE BUTTON ID WAS RETRIEVED

}