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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 |
|---|---|
| 190 | if ( ! $update && isset( $_POST['user_login'] ) && ! validate_username( $_POST['user_login'] ) ) { |
| 191 | $errors->add( 'user_login', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 192 | } |
| 193 | |
| 194 | if ( ! $update && username_exists( $user->user_login ) ) { |
| 195 | $errors->add( 'user_login', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) ); |
| 196 | } |
| 197 | |
| 198 | /** This filter is documented in wp-includes/user.php */ |
| 199 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 200 | |
| 201 | if ( in_array( strtolower( $user->user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 202 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) ); |
| 203 | } |
| 204 | |
| 205 | // Checking email address. |
| 206 | if ( empty( $user->user_email ) ) { |
| 207 | $errors->add( 'empty_email', __( '<strong>Error:</strong> Please enter an email address.' ), array( 'form-field' => 'email' ) ); |
| 208 | } elseif ( ! is_email( $user->user_email ) ) { |