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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 |
|---|---|
| 142 | } |
| 143 | |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | function register_new_user($user_login, $user_email) { |
| 148 | $errors = new WP_Error(); |
| 149 | |
| 150 | $user_login = sanitize_user( $user_login ); |
| 151 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 152 | |
| 153 | // Check the username |
| 154 | if ( $user_login == '' ) |
| 155 | $errors->add('empty_username', __('<strong>ERROR</strong>: Please enter a username.')); |
| 156 | elseif ( !validate_username( $user_login ) ) { |
| 157 | $errors->add('invalid_username', __('<strong>ERROR</strong>: This username is invalid. Please enter a valid username.')); |
| 158 | $user_login = ''; |
| 159 | } elseif ( username_exists( $user_login ) ) |
| 160 | $errors->add('username_exists', __('<strong>ERROR</strong>: This username is already registered, please choose another one.')); |