HTML Cleanup

MY_html_helper.php

<?php

/**
 * Remove html tag
 * 
 * @access       public
 * @param        string
 * @return       string
 */
function strip_html_tags($text)
{
    $text = preg_replace(
	array(
	    // Remove invisible content
	    '@<head[^>]*?>.*?</head>@siu',
	    '@<style[^>]*?>.*?</style>@siu',
	    '@<script[^>]*?.*?</script>@siu',
	    '@<object[^>]*?.*?</object>@siu',
	    '@<embed[^>]*?.*?</embed>@siu',
	    '@<applet[^>]*?.*?</applet>@siu',
	    '@<noframes[^>]*?.*?</noframes>@siu',
	    '@<noscript[^>]*?.*?</noscript>@siu',
	    '@<noembed[^>]*?.*?</noembed>@siu',

	    // Add line breaks before & after blocks
	    '@<((br)|(hr))@iu',
	    '@</?((address)|(blockquote)|(center)|(del))@iu',
	    '@</?((div)|(h[1-9])|(ins)|(isindex)|(p)|(pre))@iu',
	    '@</?((dir)|(dl)|(dt)|(dd)|(li)|(menu)|(ol)|(ul))@iu',
	    '@</?((table)|(th)|(td)|(caption))@iu',
	    '@</?((form)|(button)|(fieldset)|(legend)|(input))@iu',
	    '@</?((label)|(select)|(optgroup)|(option)|(textarea))@iu',
	    '@</?((frameset)|(frame)|(iframe))@iu',
	),
	array(
	    ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
	    "\n\$0", "\n\$0", "\n\$0", "\n\$0", "\n\$0", "\n\$0",
	    "\n\$0", "\n\$0",
	),
	$text );

    // Remove all remaining tags and comments and return.
    return strip_tags( $text );
}

/**
 * [strip_word_html clean copy and paste form word]
 * 
 * @author Tom 					<[tom@cowin.us]>
 * @link  		http://php.net/manual/en/function.strip-tags.php
 * @param  [type] $text         [description]
 * @param  string $allowed_tags [description]
 * @return [type]               [description]
 */
function strip_word_html($text, $allowed_tags = '<b><i><sup><sub><em><strong><u><br><ul><li><ol><em><strong><p>') 
{ 
    mb_regex_encoding('UTF-8'); 
    //replace MS special characters first 
    $search = array('/&lsquo;/u', '/&rsquo;/u', '/&ldquo;/u', '/&rdquo;/u', '/&mdash;/u'); 
    $replace = array('\'', '\'', '"', '"', '-'); 
    $text = preg_replace($search, $replace, $text); 
    //make sure _all_ html entities are converted to the plain ascii equivalents - it appears 
    //in some MS headers, some html entities are encoded and some aren't 
    $text = html_entity_decode($text, ENT_QUOTES, 'UTF-8'); 
    //try to strip out any C style comments first, since these, embedded in html comments, seem to 
    //prevent strip_tags from removing html comments (MS Word introduced combination) 
    if (mb_stripos($text, '/*') !== FALSE)
    { 
        $text = mb_eregi_replace('#/\*.*?\*/#s', '', $text, 'm'); 
    } 
    //introduce a space into any arithmetic expressions that could be caught by strip_tags so that they won't be 
    //'<1' becomes '< 1'(note: somewhat application specific) 
    $text = preg_replace(array('/<([0-9]+)/'), array('< $1'), $text); 
    $text = strip_tags($text, $allowed_tags); 
    //eliminate extraneous whitespace from start and end of line, or anywhere there are two or more spaces, convert it to one 
    $text = preg_replace(array('/^\s\s+/', '/\s\s+$/', '/\s\s+/u'), array('', '', ' '), $text); 
    //strip out inline css and simplify style tags 
    $search = array('#<(strong|b)[^>]*>(.*?)</(strong|b)>#isu', '#<(em|i)[^>]*>(.*?)</(em|i)>#isu', '#<u[^>]*>(.*?)</u>#isu'); 
    $replace = array('<b>$2</b>', '<i>$2</i>', '<u>$1</u>'); 
    $text = preg_replace($search, $replace, $text); 
    //on some of the ?newer MS Word exports, where you get conditionals of the form 'if gte mso 9', etc., it appears 
    //that whatever is in one of the html comments prevents strip_tags from eradicating the html comment that contains 
    //some MS Style Definitions - this last bit gets rid of any leftover comments */ 
    $num_matches = preg_match_all("/\<!--/u", $text, $matches); 
    if ($num_matches)
    { 
          $text = preg_replace('/\<!--(.)*--\>/isu', '', $text); 
    } 
    return $text; 
}