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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 |
|---|---|
| 888 | * Filters whether to bypass the email notification for new user sign-up. |
| 889 | * |
| 890 | * @since MU |
| 891 | * |
| 892 | * @param string $user_login User login name. |
| 893 | * @param string $user_email User email address. |
| 894 | * @param string $key Activation key created in wpmu_signup_user(). |
| 895 | * @param array $meta Signup meta data. |
| 896 | */ |
| 897 | if ( ! apply_filters( 'wpmu_signup_user_notification', $user_login, $user_email, $key, $meta ) ) |
| 898 | return false; |
| 899 | |
| 900 | $user = get_user_by( 'login', $user_login ); |
| 901 | $switched_locale = switch_to_locale( get_user_locale( $user ) ); |
| 902 | |
| 903 | // Send email with activation link. |
| 904 | $admin_email = get_site_option( 'admin_email' ); |
| 905 | if ( $admin_email == '' ) |
| 906 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |