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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 |
|---|---|
| 1042 | |
| 1043 | $user = get_userdata( $user_id ); |
| 1044 | |
| 1045 | $options_site_url = esc_url(network_admin_url('settings.php')); |
| 1046 | $msg = sprintf(__('New User: %1$s |
| 1047 | Remote IP: %2$s |
| 1048 | |
| 1049 | Disable these notifications: %3$s'), $user->user_login, wp_unslash( $_SERVER['REMOTE_ADDR'] ), $options_site_url); |
| 1050 | |
| 1051 | $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user ); |
| 1052 | wp_mail( $email, sprintf(__('New User Registration: %s'), $user->user_login), $msg ); |
| 1053 | return true; |
| 1054 | } |
| 1055 | |
| 1056 | /** |
| 1057 | * Check whether a blogname is already taken. |
| 1058 | * |
| 1059 | * Used during the new site registration process to ensure |
| 1060 | * that each blogname is unique. |