A function to change an email address or URL into a clickable HTML hyperlink using eregi_replace.

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<?php

function makeClickableLinks($text) {

  $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_\+.~#?&//=]+)',
    '<a href="\\1">\\1</a>', $text);
  $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~#?&//=]+)',
    '\\1<a href="http://\\2">\\2</a>', $text);
  $text = eregi_replace('([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})',
    '<a href="mailto:\\1">\\1</a>', $text);
  
return $text;

}

// Usage

// Email address example
$text = "you@example.com";
echo makeClickableLinks($text);

echo "<br /><br />";

// URL example
$text = "http://www.example.com";
echo makeClickableLinks($text);

echo "<br /><br />";

// FTP URL example
$text = "ftp://ftp.example.com";
echo makeClickableLinks($text);

?>