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I want to execute my own welcome new user email notification instead of function welcome_user_msg_filter(){} located in ms-functions.php

I recently learned how to override functions in pluggable.php, but the function I am referencing does not have its own if ( ! function_exists( 'welcome_user_msg_filter' ) ) {}.

Has anyone ever overridden a function that lives in ms-functions.php?

If so, how do you go about it?

Thanks

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1 Answer

Functions, which aren't wrapped inside functions_exists() calls, are not meant to be pluggable. If you're searching for extensions, then use filters or hooks - in case there're some.

As you can read in the phpDocBlock:

Ensure that the welcome message is not empty. Currently unused.

So this filter won't work.


I'm no MU expert, but maybe you can make use of the following filter:

apply_filters( 'wpmu_signup_blog_notification_email',
    __( "To activate your blog, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login.\n\nAfter you activate, you can visit your site here:\n\n%s" ),
    $domain, $path, $title, $user, $user_email, $key, $meta
)

You'd call it like this:

function wpse56797_signup_blog_notification_email( $message, $domain, $path, $title, $user, $user_email, $key, $meta )
{
    $message = 'Your custom notification';
    return $message;
}
add_filter( 'wpmu_signup_blog_notification_email', 'wpse56797_signup_blog_notification_email', 10, 8 );
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Ok, thanks @kaiser. Do I need to code both your apply_filters() and your function/add_filter() from your example? AND do I make them a custom plugin? Also, I am looking to intercept function welcome_user_msg_filter() so I assume where you have wpse56797_signup_blog_notification_email mine would be welcome_user_msg_filter –  frank13 Jun 28 '12 at 12:06
    
Pleas read my answer - in detail the quote I copied from the phpDocBlock - again. Then go and read through other questions inside the apply_filters to see the difference between "add" and "apply". Then take a look at the ms-functions.php file again and see where the apply_filters comes from. –  kaiser Jun 28 '12 at 12:12
    
Ok, thanks @kaiser. I did read your answer and I apologize as i am just a stupid person. I am not seeing how your example gets me to overriding function welcome_user_msg_filter(){} located ms-functions.php. I'll plug along though. Appreciate your time. –  frank13 Jun 28 '12 at 12:20
    
The phpDocBlock (in Core code above the function you're referring too), states "Ensure that the welcome message is not empty. Currently unused." . And that means, that the function isn't in use and therefore you can't use it as it won't influence anything. It's like standing in a crowd of people, shouting "PETER", when there's no one named "Peter" and therefore no one will respond. –  kaiser Jun 28 '12 at 12:37
    
I am too thick on this @kaiser. I don't know how to "ensure that the welcome message is not empty". And does "currently unused" mean that the function is not in use? Because I can tell you that on my install v3.3.2 whenever I add a new user, an email is generated coming from what is inside function welcome_user_msg_filter(){}. All I want to do is intercept that function and run my own. –  frank13 Jun 28 '12 at 12:41
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