And this is the full actual code I use, it supports passing HTML attributes as a third argument (while keeping BC):
Code:
if ( ! function_exists('auto_link'))
{
/**
* Modifies the auto_link helper (url_helper) by accepting as an optional third
* argument an array of html attributes for the anchor tags (just like the anchor helper).
*
* This array is supplied as the third argument, replacing the
* optional argument $pop in the original helper.
*
* This modified helper attempts to be backward compatible with the use of the
* original helper by accepting TRUE and FALSE as possible values for the $attributes
* argument, and giving output identical to the original usage of the helper.
*
* use: auto_link($string, 'url' , array('class' => 'external', 'target'=>'_blank'));
* use: auto_link($string, 'email', array('class' => 'email_link' , 'style' => 'color:red;'));
* use(legacy): auto_link($string, 'url' , TRUE);
*
* @link https://github.com/bcit-ci/CodeIgniter/wiki/auto-link
* @author Derek Jones (original author)
* @author Ivan Tcholakov (adaptation)
*
* @see url_helper
* @link https://codeigniter.com/user_guide/helpers/url_helper.html
* @param string $str
* @param string $type
* @param mixed $attributes
* @return string
*/
function auto_link($str, $type = 'both', $attributes = '')
{
// MAKE THE THIRD ARGUMENT BACKWARD COMPATIBLE
// here we deal with the original third argument $pop
// which could be TRUE or FALSE, and was FALSE by default.
if ($attributes === TRUE)
{
$attributes = ' target="_blank"';
}
elseif ($attributes === FALSE)
{
$attributes = '';
}
if (!empty($attributes))
{
$attributes = _stringify_attributes($attributes);
}
// Find and replace any URLs.
// Modified by Ivan Tcholakov, 19-DEC-2013, 09-MAR-2017.
//if ($type !== 'email' && preg_match_all('#(\w*://|www\.)[^\s()<>;]+\w#i', $str, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER))
if ($type !== 'email' && preg_match_all('#(\w*://|www\.)[^\s()<>;]+(\w|/)#i'.(UTF8_ENABLED ? 'u' : ''), $str, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER))
//
{
// We process the links in reverse order (last -> first) so that
// the returned string offsets from preg_match_all() are not
// moved as we add more HTML.
foreach (array_reverse($matches) as $match)
{
// $match[0] is the matched string/link
// $match[1] is either a protocol prefix or 'www.'
//
// With PREG_OFFSET_CAPTURE, both of the above is an array,
// where the actual value is held in [0] and its offset at the [1] index.
$a = '<a href="'.(strpos($match[1][0], '/') ? '' : 'http://').$match[0][0].'"'.$attributes.'>'.$match[0][0].'</a>';
$str = substr_replace($str, $a, $match[0][1], strlen($match[0][0]));
}
}
// Find and replace any emails.
if ($type !== 'url' && preg_match_all('#([\w\.\-\+]+@[a-z0-9\-]+\.[a-z0-9\-\.]+[^[:punct:]\s])#i', $str, $matches, PREG_OFFSET_CAPTURE))
{
foreach (array_reverse($matches[0]) as $match)
{
if (filter_var($match[0], FILTER_VALIDATE_EMAIL) !== FALSE)
{
$str = substr_replace($str, safe_mailto($match[0], '', $attributes), $match[1], strlen($match[0]));
}
}
}
return $str;
}
}
