// Add Shortcode
function clean_html_shortcode( $atts , $content = null ) {
	global $allowedposttags;

	if ( isset( $content, $allowedposttags ) && is_array( $allowedposttags ) ) {
		/**
		 * Allowed attributes
		 *
		 * @var array
		 */
		$allowed_html = array(
			'a'   => array( 'href' => true ),
			'img' => array( 'src' => true ),
		);
		/**
		 * Get all tags and define without any attributes
		 */
		foreach ( $allowedposttags as $tag_name => $attrs ) {
			if ( ! isset( $allowed_html[ $tag_name ] ) ) {
				$allowed_html[ $tag_name ] = array();
			}
		}
		return wp_kses( $content, $allowed_html );
	}
}
add_shortcode( 'clean_html', 'clean_html_shortcode' );