function highlight_words($subject,$search)
      {
       $info = explode(" ", $search);
       $count = substr_count($search, ' ');
       if($count == '0') { $total="1"; } else { $total = $count + 1; }
       $i=0;
       $final_results="";
       while($i <= $total)
             {
              $hlstart = "<strong>";
              $hlend = "</strong>";
              $srchlen=strlen($info[$i]);
              if ($srchlen==0) return $subject;
              $find = $subject;
              while($find = stristr($find,$info[$i]))
                    {
                     $srchtxt = substr($find, 0, $srchlen);
                     $find=substr($find,$srchlen);
                     $subject = str_replace($srchtxt,"$hlstart$srchtxt$hlend",$subject);
                    }
              $final_results="$subject";
              // return $subject;
              $i++;
             }
       return $final_results;
      }


//one func


//other func

function highlight_words($text, $needle, $options = null, $highlight = null)
{
    // Default highlighting
    if ($highlight === null) {
        $highlight = '<strong>\1</strong>';
    }
 
    // Select pattern to use
    if ($options & STR_HIGHLIGHT_SIMPLE) {
        $pattern = '#(%s)#';
        $sl_pattern = '#(%s)#';
    } else {
        $pattern = '#(?!<.*?)(%s)(?![^<>]*?>)#';
        $sl_pattern = '#<a\s(?:.*?)>(%s)</a>#';
    }
 
    // Case sensitivity
    if (!($options & STR_HIGHLIGHT_CASESENS)) {
        $pattern .= 'i';
        $sl_pattern .= 'i';
    }
 
    $needle = (array) $needle;
    foreach ($needle as $needle_s) {
        $needle_s = preg_quote($needle_s);
 
        // Escape needle with optional whole word check
        if ($options & STR_HIGHLIGHT_WHOLEWD) {
            $needle_s = '\b' . $needle_s . '\b';
        }
 
        // Strip links
        if ($options & STR_HIGHLIGHT_STRIPLINKS) {
            $sl_regex = sprintf($sl_pattern, $needle_s);
            $text = preg_replace($sl_regex, '\1', $text);
        }
 
        $regex = sprintf($pattern, $needle_s);
        $text = preg_replace($regex, $highlight, $text);
    }
 
    return $text;
}