This function is used to limit the excerpt and customize it.

Excerpt limit

//EXCERPT LIMIT
function get_excerpt(){
	$excerpt = get_the_content();
	$excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
	$excerpt = strip_shortcodes($excerpt);
	$excerpt = strip_tags($excerpt);
	$excerpt = substr($excerpt, 0, 300);
	$excerpt = substr($excerpt, 0, strripos($excerpt, " "));
	$excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
	return $excerpt.' ...';
}

function get_customexcerpt($char){
	$excerpt = get_the_excerpt();
	$excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
	$excerpt = strip_shortcodes($excerpt);
	$excerpt = strip_tags($excerpt);
	$excerpt = substr($excerpt, 0, $char);
	$excerpt = substr($excerpt, 0, strripos($excerpt, " "));
	$excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
	if($excerpt!=''):
		return $excerpt . '...';
	else:
		return $excerpt;
	endif;
}

function get_customexcerpt($char){
	$excerpt = get_the_excerpt();
	$excerptLength = strlen($excerpt);
	if($char > $excerptLength):
	$excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
	$excerpt = strip_shortcodes($excerpt);
	$excerpt = strip_tags($excerpt);
	$excerpt = substr($excerpt, 0, $char);
	$excerpt = substr($excerpt, 0, strripos($excerpt, " "));
	$excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
	$excerpt = $excerpt . '...';
	endif;
	return $excerpt;
}