I want to convert the all URLs in a string into clickable links. I found a solution in StackOverflow but probably it only works in PHP 5.2 since it uses eregi_replace() which is deprecated in PHP 5.3. So use it with cares.
<?php
function makeClickableLinks($text) {
$text = html_entity_decode($text);
$text = " ".$text;
$text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_\+.~#?&//=]+)',
'<a href="\\1" target=_blank>\\1</a>', $text);
$text = eregi_replace('(((f|ht){1}tps://)[-a-zA-Z0-9@:%_\+.~#?&//=]+)',
'<a href="\\1" target=_blank>\\1</a>', $text);
$text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~#?&//=]+)',
'\\1<a href="http://\\2" target=_blank>\\2</a>', $text);
$text = eregi_replace('([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})',
'<a href="mailto:\\1" target=_blank>\\1</a>', $text);
return $text;
}
?>
<p><?php print makeClickableLinks("Go to http://eureka.ykyuen.info"); ?></p>
<p><?php print makeClickableLinks("Send email to abc@def.com"); ?></p>
Done =)
Reference: StackOverflow – Convert plain text URLs into HTML hyperlinks in PHP
Update @ 2012-03-05: TTime proposed a function without the deprecated eregi_replace() function (compatible with php 5.3). Please refer to his comment. Thanks TTime.
Eureka! 
Here is the same function without the deprecated eregi_replace() function (compatible with php 5.3)
function makeClickableLinks($text) { $text = preg_replace('/(((f|ht){1}tp:\/\/)[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i', '<a href="\\1" rel="nofollow">\\1</a>', $text); $text = preg_replace('/([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~#?&\/\/=]+)/i', '\\1<a href="http://\\2" rel="nofollow">\\2</a>', $text); $text = preg_replace('/([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})/i', '<a href="mailto:\\1" rel="nofollow">\\1</a>', $text); return $text; }LikeLike
Thanks for your code. =D
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Spend some time looking for best solution. And could say, there is a library available which covers lots of edge cases: https://github.com/vstelmakh/url-highlight
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