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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!' ) ); |