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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 |
|---|---|
| 1315 | $update = true; |
| 1316 | $old_user_data = WP_User::get_data_by( 'id', $ID ); |
| 1317 | } else { |
| 1318 | $update = false; |
| 1319 | // Hash the password |
| 1320 | $user_pass = wp_hash_password($user_pass); |
| 1321 | } |
| 1322 | |
| 1323 | $user_login = sanitize_user($user_login, true); |
| 1324 | $user_login = apply_filters('pre_user_login', $user_login); |
| 1325 | |
| 1326 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 1327 | $user_login = trim($user_login); |
| 1328 | |
| 1329 | if ( empty($user_login) ) |
| 1330 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1331 | |
| 1332 | if ( !$update && username_exists( $user_login ) ) |
| 1333 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |