URL rewriting using drupal code

The following is an example: Copy codeThe Code is as follows :/*
* Convert the pseudo address to the original address (url_alter)
*/
Function example_url_inbound_alter (& $ path, $ original_path, $ path_language)
{
If (preg_match ('| ^ article (/. *) |', $ path, $ matches )){
$ Path = 'node'. $ matches [1];
}
}
/*
* Convert the original address to a pseudo address (url_alter)
*/
Function example_url_outbound_alter (& $ path, & $ options, $ original_path)
{
If (preg_match ('| ^ node (/. *) |', $ path, $ matches )){
$ Path = 'Article'. $ matches [1];
}
}

PS: When hook_url_inbound_alter is implemented, I do not know why the implementation function cannot be called. It may be because the HOOK is loaded too early and the module is not fully loaded. So my approach is to write it in the URL rewriting module, such as subpath_alias