functions zerif child

<?php

function custom_excerpt_length( $length ) {
    return 30;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

function new_zerif_excerpt_more( $more ) {
    return ' <a href="'. get_permalink( get_the_ID() ) . '"> ... continua a leggere <span class="meta-nav">&rarr;</span> </a>';
}
add_filter('excerpt_more', 'new_zerif_excerpt_more');

function my_undo_hooks( $more ) {
    remove_filter('excerpt_more', 'zerif_excerpt_more' );
}
add_action( 'after_setup_theme', 'my_undo_hooks' );