Some of them work in the mail manager, because they are defined there, in /class/xoopsmailer.php
foreach ($this->toUsers as $user) {
// set some user specific variables
$subject = str_replace('{X_UNAME}', $user->getVar('uname'), $this->subject);
$text = str_replace('{X_UID}', $user->getVar('uid'), $this->body);
$text = str_replace('{X_UEMAIL}', $user->getVar('email'), $text);
$text = str_replace('{X_UNAME}', $user->getVar('uname'), $text);
$text = str_replace('{X_UACTLINK}', XOOPS_URL . '/register.php?op=actv&id=' . $user->getVar('uid') . '&actkey=' . $user->getVar('actkey'), $text);
You can also define them yourself in your module, as it was done, for example in SmartObject :
public static function sanitizeForCommonTags($text)
{
global $xoopsConfig;
$text = str_replace('{X_SITENAME}', $xoopsConfig['sitename'], $text);
$text = str_replace('{X_ADMINMAIL}', $xoopsConfig['adminmail'], $text);
return $text;
}
or in tdmspot:
$body = str_replace('{X_NAME}', $user_name, $body);
$body = str_replace('{X_UNAME}', $user_uname, $body);
$body = str_replace('{X_UEMAIL}', $user_email, $body);
$body = str_replace('{X_ADMINMAIL}', $xoopsConfig['adminmail'], $body);
$body = str_replace('{X_SITENAME}', $xoopsConfig['sitename'], $body);
$body = str_replace('{X_SITEURL}', XOOPS_URL, $body);
$tpitem['text'] = $body;
$meta_keywords .= $body;
$meta_description .= $body;
Just search in all you modules for "{X_" and you'll find many examples of how it is done.
