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@ecentinela
Forked from jasny/linkify.php
Created March 27, 2012 05:06
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PHP function to turn all URLs in clickable links
<?php
/**
* Turn all URLs in clickable links.
*
* @param string $value
* @param array $protocols http/https, ftp, mail, twitter
* @param array $attributes
* @param string $mode normal or all
* @return string
*/
public function linkify($value, $protocols = array('http', 'mail'), array $attributes = array(), $mode = 'normal')
{
// Link attributes
$attr = '';
foreach ($attributes as $key => $val) {
$attr = ' ' . $key . '="' . htmlentities($val) . '"';
}
$links = array();
// Extract existing links and tags
$value = preg_replace_callback('~(<a .*?>.*?</a>|<.*?>)~i', function ($match) use (&$links) { return '<' . array_push($links, $match[1]) . '>'; }, $value);
// Extract text links for each protocol
foreach ((array)$protocols as $protocol) {
switch ($protocol) {
case 'http':
case 'https': $value = preg_replace_callback($mode != 'all' ? '~(?:(https?)://([^\s<]+)|(www\.[^\s<]+?\.[^\s<]+))(?<![\.,:])~i' : '~([^\s<]+\.[^\s<]+)(?<![\.,:])~i', function ($match) use ($protocol, &$links, $attr) { if ($match[1]) $protocol = $match[1]; $link = $match[2] ?: $match[3]; return '<' . array_push($links, '<a' . $attr . ' href="' . $protocol . '://' . $link . '">' . $link . '</a>') . '>'; }, $value); break;
case 'mail': $value = preg_replace_callback('~([^\s<]+?@[^\s<]+?\.[^\s<]+)(?<![\.,:])~', function ($match) use (&$links, $attr) { return '<' . array_push($links, '<a' . $attr . ' href="mailto:' . $match[1] . '">' . $match[1] . '</a>') . '>'; }, $value); break;
case 'twitter': $value = preg_replace_callback('~(?<!\w)[@#](\w++)~', function ($match) use (&$links, $attr) { return '<' . array_push($links, '<a' . $attr . ' href="https://twitter.com/' . ($match[0][0] == '@' ? '' : 'search/%23') . $match[1] . '">' . $match[0] . '</a>') . '>'; }, $value); break;
default: $value = preg_replace_callback($mode != 'all' ? '~' . preg_quote($protocol, '~') . '://([^\s<]+?)(?<![\.,:])~i' : '~([^\s<]+)(?<![\.,:])~i', function ($match) use ($protocol, &$links, $attr) { return '<' . array_push($links, '<a' . $attr . ' href="' . $protocol . '://' . $match[1] . '">' . $match[1] . '</a>') . '>'; }, $value); break;
}
}
// Insert all link
return preg_replace_callback('/<(\d+)>/', function ($match) use (&$links) { return $links[$match[1] - 1]; }, $value);
}
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