How to make anchor link of the urls in the text in php

How to make anchor link of the urls in the text in php

These is the code to make the text urls to links in php:

$text =$blog->blog_description; 
// Check if there is a url in the text
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
preg_match_all($reg_exUrl, $text, $matches);
$usedPatterns = array();
foreach($matches[0] as $pattern){
    if(!array_key_exists($pattern, $usedPatterns)){
        $usedPatterns[$pattern]=true;
        $text = str_replace  ($pattern, "".$pattern." ", $text);   
    }
}
echo nl2br($text);