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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 |
|---|---|
| 791 | $message = sprintf( |
| 792 | apply_filters( 'wpmu_signup_user_notification_email', |
| 793 | __( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login." ), |
| 794 | $user, $user_email, $key, $meta |
| 795 | ), |
| 796 | site_url( "wp-activate.php?key=$key" ) |
| 797 | ); |
| 798 | // TODO: Don't hard code activation link. |
| 799 | $subject = sprintf( |
| 800 | apply_filters( 'wpmu_signup_user_notification_subject', |
| 801 | __( '[%1$s] Activate %2$s' ), |
| 802 | $user, $user_email, $key, $meta |
| 803 | ), |
| 804 | $from_name, |
| 805 | $user |
| 806 | ); |
| 807 | wp_mail($user_email, $subject, $message, $message_headers); |
| 808 | return true; |
| 809 | } |