Wordpress Widow Busting Function

widow_buster.php

<?php
/**
 * Avoid widows in text by replacing the final space in each paragraph with a &nbsp;
 *
 * Inspired by David Walsh (http://davidwalsh.name/word-wrap-mootools-php)
 *
 * @param string $content Content passed into the filter
 * @return string the filtered content
 */
function wustl_widow_buster ($content) {
	$return = $content;
	$min_words = 3; // don't break small graphs
	$graphs_in = explode("</p>", $content); // break the graphs
	$graphs_out = array(); // set up the collector array
	foreach( $graphs_in as $graph ) {
		$word = explode(' ',$graph); // break each word
		if( count($word) >= $min_words ) {
			$word[count($word) - 2] .= '&nbsp;'.$word[count($word) - 1];
			array_pop($word);
		}
		$graphs_out[] = implode(' ',$word); // rebuild graphs from words
	}
	$return = implode("</p>", $graphs_out); // rebuild text from
	return $return;
}
add_filter( 'the_content', 'wustl_widow_buster');
?>