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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 |
|---|---|
| 3324 | |
| 3325 | $sanitized_user_login = sanitize_user( $user_login ); |
| 3326 | /** |
| 3327 | * Filters the email address of a user being registered. |
| 3328 | * |
| 3329 | * @since 2.1.0 |
| 3330 | * |
| 3331 | * @param string $user_email The email address of the new user. |
| 3332 | */ |
| 3333 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 3334 | |
| 3335 | // Check the username. |
| 3336 | if ( '' === $sanitized_user_login ) { |
| 3337 | $errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) ); |
| 3338 | } elseif ( ! validate_username( $user_login ) ) { |
| 3339 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 3340 | $sanitized_user_login = ''; |
| 3341 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 3342 | $errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) ); |