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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 |
|---|---|
| 760 | * @since MU |
| 761 | * |
| 762 | * @param string $user The user's login name. |
| 763 | * @param string $user_email The user's email address. |
| 764 | * @param array $meta By default, an empty array. |
| 765 | * @param string $key The activation key created in wpmu_signup_user() |
| 766 | * @return bool |
| 767 | */ |
| 768 | function wpmu_signup_user_notification($user, $user_email, $key, $meta = '') { |
| 769 | if ( !apply_filters('wpmu_signup_user_notification', $user, $user_email, $key, $meta) ) |
| 770 | return false; |
| 771 | |
| 772 | // Send email with activation link. |
| 773 | $admin_email = get_site_option( 'admin_email' ); |
| 774 | if ( $admin_email == '' ) |
| 775 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
| 776 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
| 777 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 778 | $message = sprintf( |