Autolink in PHP

autolink.php

<?php function formatText($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);

        $str = preg_replace(
            '/#([\p{L}\p{Mn}]+)/u', 
            '<a href="http://app.crohnstracker.dev/tag/$1">#$1</a>', 
            $str
        );


        return $str;
    }