A short snippet to convert a linkable text from a text to an anchor link

auto_link.php

<?php
/**
* @File auto_link.php
* @Author Ananta
**/



function auto_link($data_src){
/**
*Check  if the url is an insecure http:// url
 or short // url
*
**/
if(preg_match('/http:\/\//',$data_src) || preg_match('/\/\//',$data_src) ){
/**
*Convert for http://
**/
$http= preg_replace("/http:\/\/(.*){}/","<a href=\"\${0}\">\${0}</a>",$data_src);
return preg_replace('/{}/','',$http);
}
/**
*else it'll be https://
**/
$https= preg_replace("/https:\/\/(.*){}/","<a href=\"\${0}\">\${0}</a>",$data_src);
return preg_replace('/{}/','',$https);
}
/**
*Note: It'll only convert http:// or https:// or // protocols
*otherwise it'll be plain text
**/

/**
*Usage
 auto_link($source);
**/
//
//
//
//
/**
*It require a special link ending identifier {} after the link. 
*like http://mylink.com/{} or 
*http://mylink.com{}
*work for //mysite.com{}
*other wise it wouldn't work properly
**/

/**
*example
**/
$source='Hello. I\'m from http://weblolli.blogspot.com{}';
$source2='Hello. I\'m from https://weblolli.blogspot.com/{}';
$source3='Hello. I\'m from //weblolli.blogspot.com{}';
echo auto_link($source).'<br>';
echo auto_link($source2).'<br>';

echo auto_link($source3);
?>