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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 |
|---|---|
| 1652 | * @since MU (3.0.0) |
| 1653 | * |
| 1654 | * @param string $welcome_email Message body of the email. |
| 1655 | * @param int $blog_id Site ID. |
| 1656 | * @param int $user_id User ID of the site administrator. |
| 1657 | * @param string $password User password, or "N/A" if the user account is not new. |
| 1658 | * @param string $title Site title. |
| 1659 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
| 1660 | */ |
| 1661 | $welcome_email = apply_filters( 'update_welcome_email', $welcome_email, $blog_id, $user_id, $password, $title, $meta ); |
| 1662 | |
| 1663 | $admin_email = get_site_option( 'admin_email' ); |
| 1664 | |
| 1665 | if ( '' === $admin_email ) { |
| 1666 | $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST ); |
| 1667 | } |
| 1668 | |
| 1669 | $from_name = ( '' !== get_site_option( 'site_name' ) ) ? esc_html( get_site_option( 'site_name' ) ) : 'WordPress'; |
| 1670 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n"; |