Iframe fout: geen URL opgegeven.
'; } // Clean up content $url = trim($content); // remove spaces at start/end $url = str_replace(["\r","\n","\t"], '', $url); // remove line breaks / tabs $url = esc_url($url); // sanitize if (empty($url)) { return 'Iframe fout: ongeldige URL.
'; } $height = 800; // default height $scrolling = 'auto'; // scrollable // HEREDOC to return the iframe HTML return << HTML; } add_shortcode('iframe', 'philidor_iframe_shortcode');