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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 881 | apply_filters( 'wpmu_signup_user_notification_email', |
| 882 | __( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login.\n\n" ), |
| 883 | $user, $user_email, $key, $meta |
| 884 | ), |
| 885 | site_url( "wp-activate.php?key=$key" ), |
| 886 | $key |
| 887 | ); |
| 888 | // TODO: Don't hard code activation link. |
| 889 | $subject = sprintf( |
| 890 | apply_filters( 'wpmu_signup_user_notification_subject', |
| 891 | __( '[%1$s] Activate %2$s' ), |
| 892 | $user, $user_email, $key, $meta |
| 893 | ), |
| 894 | $from_name, |
| 895 | $user |
| 896 | ); |
| 897 | wp_mail($user_email, $subject, $message, $message_headers); |
| 898 | return true; |
| 899 | } |