Simple wordpress plug to avoid typographical widows

no-widows.php

<?php
/*
Plugin Name: No Widows
Plugin URI: http://timwhitlock.info/
Description: Prevents typographical widows in titles and post body content
Author: Tim Whitlock
Version: 1.0
Author URI: http://timwhitlock.info/
*/


/**
 * Filter function, prevents all end of lines breaking with a widow
 * @param string original html-encoded text
 * @return string new widowless html
 */
function no_widows_filter_html( $html ){
    return preg_replace_callback( '/(\s+)(\S+)$/m', 'no_widows_filter_html_callback', $html);
}


/**
 * Replacement callback function
 * @internal
 */
function no_widows_filter_html_callback( array $match ){
    list(,,$word) = $match;
    // word may also contain breaking characters
    $hyphens = array ( 
    	'-', 
    	'&ndash;', '&#8211;', '&#x2013;', "\x2013",
    	'&mdash;', '&#8212;', '&#x2014;', "\x2014",
    );
    // replace any dash with non-breaking hyphen
    $word = str_ireplace( $hyphens, '&#8209;', $word );
    // return widow with single non-breaking space in place of whitespace
    return '&nbsp;'.$word;
}


// apply filter to title and content as desired
add_filter('the_title','no_widows_filter_html');
add_filter('the_content','no_widows_filter_html');