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This code and shortcode allows you to pull in any field from any post or related post on the site.
Use this shortcode in your content. Change it based on your fields and relationship.
[post_meta post_id="123" meta_key="your_custom_field_key"]
[post_meta post_id="@post(post-relation.id)" meta_key="your_custom_field_key"]
function custom_post_meta_shortcode($atts) {
// Shortcode attributes - includes defaults
$atts = shortcode_atts(
array(
'post_id' => 0, // default to current post
'meta_key' => '', // no default key
'single' => true, // whether to return a single value
),
$atts,
'post_meta'
);// Retrieve post meta
$meta_value = get_post_meta($atts['post_id'], $atts['meta_key'], $atts['single']);// Return the meta value if it exists, otherwise return an empty string
return $meta_value ? $meta_value : '';
}// Register the shortcode with WordPress
add_shortcode('post_meta', 'custom_post_meta_shortcode');