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/**
* Converts the argument to a visible (X)HTML hyperlink
* where its URI target is created from the argument.
* Supported are e-mail addresses, domain names with
* optional paths, and valid URIs.
*
* @param $text
* Argument to be converted.
* @return
* The converted argument if it applies to a supported
* scheme, the unconverted argument otherwise.
*
* @author (C) 2001-04-04T02:03
* mark.young@vdhinc.com at http://php.net/manual/en/ref.strings.php
*
* Minor correction to my HTMLEncode function.
*
* @author 2002-08-29T09:00
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Added target="_blank"
* - Added support for ftp(s)-URIs: (ht|f)
* - Added support for search strings (?...=...&...=...), either
* with or without HTML entities: \?=(&\w;|&)
* - Removed enclosing nl2br call because of preformatted display
*
* @author 2003-12-30T14:18
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Removed target="_blank".
* - Added PHPdoc.
*
* @author 2004-01-12T12:45
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Added support for #fragment_identifiers in URIs.
* - Added support for bugs and comments.
*
* @author 2004-01-13T01:29
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Added support for bug aliases.
*
* @author 2004-01-26T20:43
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Do not convert URIs in A elements.
* - Do not allow URIs with "&" before search-string.
* - camelCased function identifier. Only classes
* and constructors should start with uppercase.
*
* @author 2004-01-27T14:07
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Allow to convert URIs preceded by ">" but not followed by "</a>".
* - Allow ";" to be part of the search string
*
* @author 2004-01-29T14:10
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Require valid domain name for "bar" on conversion of "foo@bar" and
* "www.bar".
* - Be case-insensitive except of bug aliases
* - Escaped "-" in character classes if not meant as range metacharacter.
* - Corrected year.
*
* @author 2004-02-14T17:37
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Accept only valid Internet domain names
* - Accept "%" within path and query part (to escape ASCII characters)
*
* @author 2004-02-27T19:21
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Allow unescaped ":" in URI components, since it apparently does not
* "conflict with the reserved purpose" (RFC 2396, section 2.2.; here:
* scheme component)
* - Allow slashes, dots and dashes in URI components
* - Removed invalid [...(...|...)...]
*
* @author 2004-03-01T21:48
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Allow IPv4 addresses
*
* @author 2004-03-08T02:20
* Thomas Lahn <PointedEars@selfhtml.de> at localhost
*
* - Allow "+" and "," in query part
* - Optimized character classes
*/
function htmlEncode
($text)
{
$searcharray = array(
"'(?i)([\-_\w\d.]+@[\-\w\d.]+\.[A-Z]{2,})'i",
"'(?i)((?:(?!://).{3}|^.{0,2}))(www\.[\-\w\d.]+\.[A-Z]{2,}"
. "|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'i",
"'(?i)(?<!href=\")((ht|f)tps?:\/\/([\-\w\d.]+\.[A-Z]{2,}"
. "|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})[#\-_~\w\d\.\/%]+"
. "(\?([%&+-;=\w])*)?(;[=\d\w])?)(?!</a>)'i",
"'(((?i)bug)\s+#?([\dA-Z_]+)\s+((?i)comment|Kommentar)\s+#?(\d+))'",
"'(((?i)bug)\s+#?([\dA-Z_]+))'",
"'(((?i)comment|Kommentar)\s+#?(\d+))'"
);
$replacearray = array(
"<a href=\"mailto:\\1\">\\1</a>",
"\\1http://\\2",
"<a href=\"\\1\">\\1</a>",
"<a href=\"./?bug=\\3#c\\5\">\\1</a>",
"<a href=\"./?bug=\\3#details\">\\1</a>",
"<a href=\"#c\\3\">\\1</a>"
);
return preg_replace($searcharray, $replacearray, $text);
}