Simple function to Change the length of an excerpt.

truncate_post

<?php

## Truncate Post
function custom_excerpt_length(){
	global $excerpt_length;
	return $excerpt_length;
}

function custom_excerpt_more(){
	global $excerpt_more;
	return $excerpt_more;
}

function truncate_post($length = 55, $more = '[...]',$echo = true){
	global $excerpt_length, $excerpt_more;
	$excerpt_length = (int)$length;
	$excerpt_more = $more;
	add_filter('excerpt_length', 'custom_excerpt_length');
	add_filter('excerpt_more', 'custom_excerpt_more');
	$excerpt = get_the_excerpt();
	remove_filter('excerpt_length', 'custom_excerpt_length');
	remove_filter('excerpt_more', 'custom_excerpt_more');
	if($echo){
		echo $excerpt;
	}else{
		return $excerpt;
	}
}


?>