Manual:Hooks/LinkBegin

Details
Return false to skip default processing and return $ret.

See documentation for Linker::link for details on the expected meanings of parameters.

used to be a skin, but that eliminated. the Title that the link is pointing to. the HTML attributes (such as title and class; href is ignored) that the  tag should have, in associative array form, with keys and values unescaped. Should be merged with default values, with a value of false meaning to suppress the attribute. Other attributes will replace default attributes. the query string to add to the generated URL (the bit after the "?"), in associative array form, with keys and values unescaped. Query keys and values will be URL-encoded. the options. Can include 'known', 'broken', 'noclasses', 'forcearticlepath', 'http', or 'https'. the value to return if your hook returns false.
 * $dummy:
 * $target:
 * &$html
 * &$customAttribs:
 * &$query:
 * &$options:
 * &$ret:

$options values
Page is known to exist, so don't check if it does. Page is known not to exist, so don't check if it does. Don't add any classes automatically (includes "new", "stub", "mw-redirect", "extiw"). Only use the class attribute provided, if any, so you get a simple blue link with no funny icons. Use the article path always, even with a querystring. Has compatibility issues on some setups, so avoid wherever possible. Force a full URL with http:// as the scheme. Force a full URL with https:// as the scheme.
 * 'known':
 * 'broken':
 * 'noclasses':
 * 'forcearticlepath':
 * 'http':
 * 'https':

Example
The following code will show all wikilinks as broken (i.e. as red links) by changing the  class to "new":

Another way to achieve the same result would be to change  instead of   and return , like this:

Note that neither of these examples will have any effect on interwiki links.

For that, you'll need to use .

See man>Special:MyLanguage/Manual:Hooks/LinkEnd#Example|the example.