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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 |
|---|---|
| 3309 | |
| 3310 | $sanitized_user_login = sanitize_user( $user_login ); |
| 3311 | /** |
| 3312 | * Filters the email address of a user being registered. |
| 3313 | * |
| 3314 | * @since 2.1.0 |
| 3315 | * |
| 3316 | * @param string $user_email The email address of the new user. |
| 3317 | */ |
| 3318 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 3319 | |
| 3320 | // Check the username. |
| 3321 | if ( '' === $sanitized_user_login ) { |
| 3322 | $errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) ); |
| 3323 | } elseif ( ! validate_username( $user_login ) ) { |
| 3324 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 3325 | $sanitized_user_login = ''; |
| 3326 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 3327 | $errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) ); |