snip-shortcodes.php

<?php
/*
Plugin Name: SNIP Shortcode Example
Description: A plugin that allows to add shortcode-content to schema properties.
Author: Florian Simeth
Version: 0.1.0
Author URI: https://rich-snippets.io
Plugin URI: https://rich-snippets.io/shortcode-content-in-properties/
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit;
} // Exit if accessed directly

/**
 *
 * PHP Version check.
 *
 */
if ( version_compare( PHP_VERSION, '7.0', '<' ) ) {
	add_action( 'admin_notices', 'snip_scc_old_php_notice' );

	function snip_scc_old_php_notice() {

		printf(
			'<div class="notice error"><p>%s</p></div>',
			sprintf(
				__( 'Hey mate! Sorry for interrupting you. It seem\'s that you\'re using an old PHP version (your current version is %s). You should upgrade to at least 7.0 or higher in order to use the SNIP Shortcode plugin. Thank you!', 'snip-scc' ),
				esc_html( PHP_VERSION )
			)
		);
	}

	# sorry. The plugin will not work with an old PHP version.
	return;
}


add_filter( 'wpbuddy/rich_snippets/fields/internal_subselect/values', 'snip_scc_subselects' );

/**
 * Adds new field to use in Global Snippets in the SNIP plugin.
 *
 * @param array $values
 *
 * @return array
 * @since 0.1.0
 *
 */
function snip_scc_subselects( $values ) {

	$values['http://schema.org/Text'][] = [
		'id'     => 'textfield_snip_scc_shortcode',
		'label'  => esc_html_x( 'Shortcode content', 'subselect field', 'snip-scc' ),
		'method' => 'snip_scc_callback',
	];

	return $values;
}


/**
 * Returns the value.
 *
 * @param                                     $val
 * @param \wpbuddy\rich_snippets\Rich_Snippet $rich_snippet
 * @param array $meta_info
 *
 * @return int|float
 */
function snip_scc_callback( $val, \wpbuddy\rich_snippets\Rich_Snippet $rich_snippet, array $meta_info ) {
	$shortcode_content = do_shortcode( $val );

	return strip_tags( $shortcode_content );
}