Filters Advanced Custom Fields (ACF) and The SEO Framework (TSF) description and titles

acf-tsf.php

<?php

/**
 * 'the_seo_framework_custom_field_description' of the filter below can be changed with:
 * - the_seo_framework_title_from_custom_field
 * - the_seo_framework_title_from_generation
 * - the_seo_framework_generated_description
 * - the_seo_framework_custom_field_description
 *
 * And many other filters that follow the ( $value, $args ) schema.
 * - the_seo_framework_enable_auto_description
 * - the_seo_framework_image_details
 * - the_seo_framework_image_generation_params
 * - the_seo_framework_use_title_branding
 * - the_seo_framework_robots_meta_array
 *
 * Also this one, but the parameter is shifted, see https://gist.github.com/sybrew/8c55f48bb3d8bdff03af0d2ba6271bb4):
 * - the_seo_framework_fetched_description_excerpt
 */

add_filter( 
    'the_seo_framework_custom_field_description',
    function( $description, $args ) {

        if ( null === $args ) {
            // Front-end
            if ( is_singular() )
                $post_id = tsf()->get_the_real_ID();
        } else {
            // Custom query, back-end.
            if ( empty( $args['pta'] ) && empty( $args['taxonomy'] ) )
                $post_id = $args['id'];
        }

        if ( ! empty( $post_id ) && function_exists( 'get_field' ) ) 
            $custom_field = get_field( 'my_custom_content', $post_id );

        if ( ! empty( $custom_field ) ) 
            $description = $custom_field;            
        
        return $description;
    },
    10,
    2
);