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// stolen from class-avada-blog.php
// Create an excerpt stripping out avada shortcodes but not the shortcode content
// You will need the content from the post object not just the post id
// i.e. get_post($post_id)->post_content 

function get_content_stripped_and_excerpted( $excerpt_length, $content ) {
	$pattern = get_shortcode_regex();
	$content = preg_replace_callback( "/$pattern/s", 'fusion_extract_shortcode_contents', $content );
	$content = explode( ' ', $content, $excerpt_length + 1 );

	if ( $excerpt_length < count( $content ) ) {
		array_pop( $content );
	}

	$content = implode( ' ', $content );
	$content = preg_replace( '~(?:\[/?)[^/\]]+/?\]~s', '', $content ); // Strip shortcodes and keep the content.
	$content = str_replace( ']]>', ']]&gt;', $content );
	$content = strip_tags( $content );
	$content = str_replace( array( '"', "'" ), array( '&quot;', '&#39;' ), $content );
	$content = trim( $content );

	return $content;

}