add_shortcode example

add_shortcode.php

add_shortcode( 'faq', 'process_the_faq_shortcode' );
/**
 * Process the FAQ Shortcode to build a list of FAQs.
 *
 * @since 1.0.0
 *
 * @param array|string $user_defined_attributes User defined attributes for this shortcode instance
 * @param string|null $content Content between the opening and closing shortcode elements
 * @param string $shortcode_name Name of the shortcode
 *
 * @return string
 */
function process_the_faq_shortcode( $user_defined_attributes, $content, $shortcode_name ) {
	$attributes = shortcode_atts(
		array(
			'number_of_faqs' => 10,
			'class'          => '',
		),
		$user_defined_attributes,
		$shortcode_name
	);

	// do the processing

	// Call the view file, capture it into the output buffer, and then return it.
	ob_start();
	include( __DIR__ . '/views/faq-shortcode.php' );
	return ob_get_clean();
}