Save ACF metadata to post_content on save

save_acf_to_post_content.php

// *******************************
// Future-Proof content by saving ACF content to post_content
// -------------------------------
function save_acf_rich_text_to_post_content( $post_id ) {
	
	if ( get_post_type( $post_id ) == ( 'post' || 'page' ) ) {
		
		// Get ACF flex content
		if( have_rows('content_blocks') ) {
			$post_content = '';
			while ( have_rows('content_blocks') ) {
				the_row();
	    		if( get_row_layout() == 'banner' ) {
	    			$post_content.= wp_get_attachment_image( get_sub_field('image_large') , 'banner_large' );
	    			$post_content.= wp_get_attachment_image( get_sub_field('image_small') , 'banner_small' );
	    			$post_content.= '<h4>' . get_sub_field('prefix') . '</h4>';
	    			$post_content.= '<h2>' . get_sub_field('title') . '</h2>';
	    		}
        		if( get_row_layout() == 'form' ) {
        			$form = get_sub_field('form');
        			$post_content.= '[ninja_form id=' .  $form['id'] . ']';
        		}
	    		if( get_row_layout() == 'header' ) {
	    			$post_content.= '<h4>' . get_sub_field('prefix') . '</h4>';
	    			$post_content.= '<h2>' . get_sub_field('title') . '</h2>';
	    			$post_content.= '<p>' . get_sub_field('intro') . '</p>';
	    		}
	    		if( get_row_layout() == 'image' ) {
	    			$post_content.= wp_get_attachment_image( get_sub_field('image') , 'medium' );
	    			$post_content.= '<p>' . get_sub_field('description') . '</p>';
	    		}
        		if( get_row_layout() == 'richtext' ) {
        			$post_content.= get_sub_field('content');
        		}
        		if( get_row_layout() == 'gallery' ) {
        			$gallery_images = get_sub_field('gallery');
        			$gallery_ids = '';
        			foreach ($gallery_images as $gallery_image) {
        				$gallery_ids.= $gallery_image['id'] . ',';
        			}
       				$post_content.= '[gallery ids="' . $gallery_ids . '"]';
        		}
        		if( get_row_layout() == 'icons' ) {
        			$icons = get_sub_field('icons');
        			foreach ($icons as $icon) {
        				$post_content.= '<h6>' . $icon['label'] . '</h6>';
        				$post_content.= '<p>' . $icon['excerpt'] . '</p>';
        			}
        		}
			}
		}
		
		// Save ACF WYSIWYG content to post_content
		$my_post = array(
			'ID' => $post_id,
			'post_content' => $post_content,
		);
	  	wp_update_post($my_post);
	  }
	  
	if ( get_post_type( $post_id ) == ( 'attraction' || 'package' || 'program' || 'group' ) ) {
		
		// Get ACF flex content
		if( get_field('details') ) {
        	$post_content.= get_field('details');
		}
		
		// Save ACF WYSIWYG content to post_content
		$my_post = array(
			'ID' => $post_id,
			'post_content' => $post_content,
		);
	  	wp_update_post($my_post);
	}
}
add_action('acf/save_post', 'save_acf_rich_text_to_post_content', 20);