RSS Feed embedding using shortcode(s). Implemented as function instead of class, both for easier copy + paste into the functions.php file of your current (child) theme, and also quicker understanding whats going on :) #wordpress #classicpress

shortcode-functions.php

<?php
/**
 * RSS Feed embedding using shortcode(s). Implemented as function instead of class, both for easier copy + paste into the functions.php file of your current (child) theme, and also quicker understanding whats going on :)
 * Normally, this would be implemented as a class with a nifty auto-loader / auto-shortcode registration.
 * 
 * @author Fabian Wolf (@link https://wp-devil.de/)
 */

if( !function_exists( 'wp_rss' ) ) {
	include_once( ABSPATH . WPINC . '/rss.php' );
}

if( !function_exists( '__rss_feed_shortcode' ) ) {

	function __rss_feed_shortcode( $attr = array(), $content = '' ) {
		$return = '';
		
		$default_attr = array(
			'url' => '',
			'feed' => '', // alias for 'url'
			'limit' => 5,
		);
		
		extract( shortcode_atts( $default_attr, $attr ), EXTR_SKIP );
		
		if( !empty( $url ) ) {
			if( empty( $limit ) ) {
				$limit = -1;
			} else {
				$limit = intval( $limit );
			}
			
			// additional safety
			if( function_exists( 'wp_rss' ) ) {
				$html_rss = wp_rss( $url, $limit );
			}
			
			if( !empty( $html_rss ) ) {
				$return = $html_rss;
			}
		}
		
		return $return;
	}
	
}

if( function_exists( '__rss_feed_shortcode' ) ) {
	add_shortcode( 'rss_feed', '__rss_feed_shortcode' );
}

// closing tag intentionally left out ;-)