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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 |
|---|---|
| 1854 | * Content should be formatted for transmission via wp_mail(). |
| 1855 | * |
| 1856 | * @since MU (3.0.0) |
| 1857 | * |
| 1858 | * @param string $welcome_email The message body of the account activation success email. |
| 1859 | * @param int $user_id User ID. |
| 1860 | * @param string $password User password. |
| 1861 | * @param array $meta Signup meta data. Default empty array. |
| 1862 | */ |
| 1863 | $welcome_email = apply_filters( 'update_welcome_user_email', $welcome_email, $user_id, $password, $meta ); |
| 1864 | $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email ); |
| 1865 | $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email ); |
| 1866 | $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email ); |
| 1867 | $welcome_email = str_replace( 'LOGINLINK', wp_login_url(), $welcome_email ); |
| 1868 | |
| 1869 | $admin_email = get_site_option( 'admin_email' ); |
| 1870 | |
| 1871 | if ( '' === $admin_email ) { |
| 1872 | $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST ); |