FacetWP – limit characters for the Builder “Post Excerpt” item

<?php

add_filter( 'facetwp_builder_item_value', function( $value, $item ) {
    if ( 'post_excerpt' == $item['source'] ) {
        $value = substr( $value, 0, 120 ); // limit to 120 characters
    }
    return $value;
}, 10, 2 );