/**
* Function to instantiate our class and make it a singleton
*/
public static function get_instance()
{
if (!self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* If a link is outgoing, add an onclick that runs some Google JS with a
* generated URL
*
* @param array $m - A match from the preg_replace_callback in self::get_links
* @return string - modified andchor tag
*/
function handle_link($m)
{
$code = wpGoogleAnalytics::get_options('code');
//get our site url...used to see if the link is outgoing. We can't use the wordpress setting, because wordpress might not be running at the document root.
$site_url = ($_SERVER['HTTPS'] == 'on' ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'];
$link = array_pop($m);
//If the link is outgoing, we modify $m[0] (the anchor tag)
if (preg_match("/^https?:\\/\\//i", $link) && strpos(strtolower($link), strtolower($site_url)) !== 0) {
//get our custom link
$track['data'] = $link;
$track['code'] = 'outgoing';
$track['url'] = wpGoogleAnalytics::get_url($track);
// Check which version of the code the user is using, and user proper function
$function = strpos($code, 'ga.js') !== false ? 'pageTracker._trackPageview' : 'urchinTracker';
$onclick = "{$function}('{$track['url']}');";
//If there is already an onclick, add to the beginning of it (adding to the end will not work, because too many people leave off the ; from the last statement)
if (preg_match("/onclick\\s*=\\s*(['\"])/iUx", $m[0], $match)) {
//If the onclick uses single quotes, we use double...and vice versa
if ($match[1] == "'") {
$onclick = str_replace("'", '"', $onclick);
}
$m[0] = str_replace($match[0], $match[0] . $onclick, $m[0]);
} else {
$m[0] = str_replace('>', " onclick=\"{$onclick}\">", $m[0]);
}
}
//return the anchor tag (modified or not)
return $m[0];
}
