Use ACF images combined with Yoast SEO default image

acf-yoast-og.php

<?php


/**
 * Remove default output of og:image from yoast
 */
add_filter('wpseo_frontend_presenter_classes', function ($filter) {
  $presenter_to_remove = [
    'Yoast\WP\SEO\Presenters\Open_Graph\Image_Presenter'
  ];

  foreach ($presenter_to_remove as $presenter) {
    if (($key = array_search($presenter, $filter)) !== false) {
      unset($filter[$key]);
    }
  }

  return $filter;
});


/**
 * Use images from ACF field as og:images
*/
function acf_images_as_og () {
  global $post;

  if (!$post) {
    return;
  }

  $images = get_field('images', $post->ID);

  if ($images) {
    foreach ($images as $image_id) {
      $image = wp_get_attachment_image_src($image, 'large');

      if (isset($image[0])) {
        echo "<meta property=\"og:image\" content=\"" . $image[0] . "\">\n";
      }
    }
  }

  // If Yoast SEO is installed, use that image as default aswell.
  if (class_exists('WPSEO_Options', false)) {
    $default_image = WPSEO_Options::get('og_default_image');

    if ($default_image) {
      echo "<meta property=\"og:image\" content=\"" . $default_image . "\">\n";
    }
  }
}