Convert plain text URLs in a string to clickable links

autolink

<?php
//From http://code.seebz.net/p/autolink-php/

//Convert plain text URLs into clickable links
function autolink($str, $attributes=array()) {
    $attrs = '';
    foreach ($attributes as $attribute => $value) {
        $attrs .= " {$attribute}=\"{$value}\"";
    }
 
    $str = ' ' . $str;
    $str = preg_replace(
        '`([^"=\'>])((http|https|ftp)://[^\s<]+[^\s<\.)])`i',
        '$1<a href="$2"'.$attrs.'>$2</a>',
        $str
    );
    $str = substr($str, 1);
     
    return $str;
}
?>