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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 |
|---|---|
| 300 | * |
| 301 | * @param string $user_login User's username for logging in |
| 302 | * @param string $user_email User's email address to send password and add |
| 303 | * @return int|WP_Error Either user's ID or error on failure. |
| 304 | */ |
| 305 | function register_new_user( $user_login, $user_email ) { |
| 306 | $errors = new WP_Error(); |
| 307 | |
| 308 | $sanitized_user_login = sanitize_user( $user_login ); |
| 309 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 310 | |
| 311 | // Check the username |
| 312 | if ( $sanitized_user_login == '' ) { |
| 313 | $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) ); |
| 314 | } elseif ( ! validate_username( $user_login ) ) { |
| 315 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 316 | $sanitized_user_login = ''; |
| 317 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 318 | $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) ); |