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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 |
|---|---|
| 1585 | * @since MU (3.0.0) |
| 1586 | * |
| 1587 | * @param string $welcome_email Message body of the email. |
| 1588 | * @param int $blog_id Blog ID. |
| 1589 | * @param int $user_id User ID. |
| 1590 | * @param string $password User password. |
| 1591 | * @param string $title Site title. |
| 1592 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
| 1593 | */ |
| 1594 | $welcome_email = apply_filters( 'update_welcome_email', $welcome_email, $blog_id, $user_id, $password, $title, $meta ); |
| 1595 | $admin_email = get_site_option( 'admin_email' ); |
| 1596 | |
| 1597 | if ( $admin_email == '' ) |
| 1598 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
| 1599 | |
| 1600 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
| 1601 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 1602 | $message = $welcome_email; |
| 1603 | |