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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 |
|---|---|
| 1995 | |
| 1996 | $sanitized_user_login = sanitize_user( $user_login ); |
| 1997 | /** |
| 1998 | * Filter the email address of a user being registered. |
| 1999 | * |
| 2000 | * @since 2.1.0 |
| 2001 | * |
| 2002 | * @param string $user_email The email address of the new user. |
| 2003 | */ |
| 2004 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 2005 | |
| 2006 | // Check the username |
| 2007 | if ( $sanitized_user_login == '' ) { |
| 2008 | $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) ); |
| 2009 | } elseif ( ! validate_username( $user_login ) ) { |
| 2010 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 2011 | $sanitized_user_login = ''; |
| 2012 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 2013 | $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) ); |