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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 |
|---|---|
| 897 | * Filter whether to bypass the email notification for new user sign-up. |
| 898 | * |
| 899 | * @since MU |
| 900 | * |
| 901 | * @param string $user User login name. |
| 902 | * @param string $user_email User email address. |
| 903 | * @param string $key Activation key created in wpmu_signup_user(). |
| 904 | * @param array $meta Signup meta data. |
| 905 | */ |
| 906 | if ( ! apply_filters( 'wpmu_signup_user_notification', $user, $user_email, $key, $meta ) ) |
| 907 | return false; |
| 908 | |
| 909 | // Send email with activation link. |
| 910 | $admin_email = get_site_option( 'admin_email' ); |
| 911 | if ( $admin_email == '' ) |
| 912 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
| 913 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
| 914 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 915 | $message = sprintf( |