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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 |
|---|---|
| 1879 | /** |
| 1880 | * Filter a username after it has been sanitized. |
| 1881 | * |
| 1882 | * This filter is called before the user is created or updated. |
| 1883 | * |
| 1884 | * @since 2.0.3 |
| 1885 | * |
| 1886 | * @param string $sanitized_user_login Username after it has been sanitized. |
| 1887 | */ |
| 1888 | $pre_user_login = apply_filters( 'pre_user_login', $sanitized_user_login ); |
| 1889 | |
| 1890 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 1891 | $user_login = trim( $pre_user_login ); |
| 1892 | |
| 1893 | if ( empty( $user_login ) ) { |
| 1894 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1895 | } |
| 1896 | if ( ! $update && username_exists( $user_login ) ) { |
| 1897 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |