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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 |
|---|---|
| 1058 | |
| 1059 | $user = get_userdata( $user_id ); |
| 1060 | |
| 1061 | $options_site_url = esc_url(network_admin_url('settings.php')); |
| 1062 | $msg = sprintf(__('New User: %1$s |
| 1063 | Remote IP: %2$s |
| 1064 | |
| 1065 | Disable these notifications: %3$s'), $user->user_login, $_SERVER['REMOTE_ADDR'], $options_site_url); |
| 1066 | |
| 1067 | $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user ); |
| 1068 | wp_mail( $email, sprintf(__('New User Registration: %s'), $user->user_login), $msg ); |
| 1069 | return true; |
| 1070 | } |
| 1071 | |
| 1072 | /** |
| 1073 | * Check whether a blogname is already taken. |
| 1074 | * |
| 1075 | * Used during the new site registration process to ensure |
| 1076 | * that each blogname is unique. |