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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 |
---|---|
917 | * Filter whether to bypass the email notification for new user sign-up. |
918 | * |
919 | * @since MU |
920 | * |
921 | * @param string $user User login name. |
922 | * @param string $user_email User email address. |
923 | * @param string $key Activation key created in wpmu_signup_user(). |
924 | * @param array $meta Signup meta data. |
925 | */ |
926 | if ( ! apply_filters( 'wpmu_signup_user_notification', $user, $user_email, $key, $meta ) ) |
927 | return false; |
928 |
|
929 | // Send email with activation link. |
930 | $admin_email = get_site_option( 'admin_email' ); |
931 | if ( $admin_email == '' ) |
932 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
933 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
934 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
935 | $message = sprintf( |