Dynamic custom length excpert

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<?php
// Variable & intelligent excerpt length.
function print_excerpt($length) { // Max excerpt length. Length is set in characters
	global $post;
	$text = $post->post_excerpt;
	if ( '' == $text ) {
		$text = get_the_content('');
		$text = apply_filters('the_content', $text);
		$text = str_replace(']]>', ']]>', $text);
	}
	$text = strip_shortcodes($text); // optional, recommended
	$text = strip_tags($text); // use ' $text = strip_tags($text,'&lt;p&gt;&lt;a&gt;'); ' if you want to keep some tags

	$text = substr($text,0,$length);
	$excerpt = reverse_strrchr($text, '.', 1);
	if( $excerpt ) {
		echo apply_filters('the_excerpt',$excerpt);
	} else {
		echo apply_filters('the_excerpt',$text);
	}
}

// Returns the portion of haystack which goes until the last occurrence of needle
function reverse_strrchr($haystack, $needle, $trail) {
    return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack, $needle) + $trail) : false;
}
?>

Instructions:

The snippet will return the excerpt with a maximum length of predetermined length and removes everything after the last sentence within the excerpt. So that the excerpt will NOT cut off mid-sentence.

Here is an example how to use the function in your theme templates.

<?php print_excerpt(50); ?>

This will return the excerpt with a maximum length of 50 characters and removes everything after the last sentence within the excerpt.