HTML

URL hilight
Type:	code fragment
Added by:	hdn
Entered:	14/10/2003
Last modified:	02/11/2002
Rating:	- (fewer than 3 votes)
Views:	3611
A function to efficiently and CORRECTLY hilight any non-linked url in a text or html document. This is accomplished by first lifting all linked urls and urls that shouldn't be linked - such as those in embed, img, link ... tags. Then it will link urls that should be linked. Finally, it puts previously lifted urls back where they belong.
<?php
function url_hilight($str)

                            {   

                                // lift all links, images and image maps

                                $url_tags = array (

                                                 "'<a[^>]*>.*</a>'si",

                                                 "'<map[^>]*>.*</map>'si",

                                                 "'<script[^>]*>.*</script>'si",

                                                 "'<style[^>]*>.*</style>'si",

                                                 "'<applet[^>]*>'si",

                                                 "'<object[^>]*>'si",

                                                 "'<embed[^>]*>'si",

                                                 "'<link[^>]*>'si",

                                                 "'<img[^>]*>'si"

                                                  );

                                foreach($url_tags as $url_tag)

                                {

                                    preg_match_all($url_tag, $str, $matches, PREG_SET_ORDER);

                                    foreach($matches as $match)

                                    {

                                        $key = "<" . md5($match[0]) . ">";

                                        $search[] = $key;

                                        $replace[] = $match[0];

                                    }

                                }

                            

                                $str = str_replace($replace, $search, $str);

                            

                                // indicate where urls end if they have these trailing special chars

                                $sentinals = array("'&(quot|#34);'i",                 // Replace html entities

                                                   "'&(lt|#60);'i",

                                                   "'&(gt|#62);'i",

                                                   "'&(nbsp|#160);'i",

                                                   "'&(iexcl|#161);'i",

                                                   "'&(cent|#162);'i",

                                                   "'&(pound|#163);'i",

                                                   "'&(copy|#169);'i",

                                                   "'&#(d+);'e");

                                $str = preg_replace($sentinals, "<sentinal>\0<sentinal>", $str);

                            

                                $vdom = "[:alnum:]";                // Valid domain chars

                                $vurl = $vdom."_~-";                // Valid subdomain and path chars

                                //$vura = "�-��-�!#$%&*+,;=@.".$vurl; // Valid additional parameters (after '?') chars;

                                $vura = "�-��-�!#$%&*+,;=@./".$vurl; // Valid additional parameters (after '?') chars;

                                                                    // insert other local characters if needed


                                $protocol = "[[:alpha:]]{3,10}://"; // Protocol exp

                                $server = "([$vurl]+[.])*[$vdom]+"; // Server name exp

                                $path = "(([$vurl]+([.][$vurl]+)*/)|([.]{1,2}/))*"; // Document path exp (/.../)

                                $name = "[$vurl]+([.][$vurl]+)*";   // Document name exp

                                $params = "[?][$vura]*";            // Additional parameters (for GET)

                            

                                $str = eregi_replace("$protocol$server(/$path($name)?)?($params)?",  "<a href="\0">\0</a>", $str); // URL into links

                            

                            

                                $str = str_replace("<sentinal>", '', $str);

                                return str_replace($search, $replace, $str);

                            }
?>
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