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Source View: user_registration_email

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

Line Code
285  *
286  * @param string $user_login User's username for logging in
287  * @param string $user_email User's email address to send password and add
288  * @return int|WP_Error Either user's ID or error on failure.
289  */
290 function register_new_user( $user_login, $user_email ) {
291      $errors = new WP_Error();
292
293      $sanitized_user_login = sanitize_user( $user_login );
294      $user_email = apply_filters( 'user_registration_email', $user_email );
295
296      // Check the username
297      if ( $sanitized_user_login == '' ) {
298           $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) );
299      } elseif ( ! validate_username( $user_login ) ) {
300           $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) );
301           $sanitized_user_login = '';
302      } elseif ( username_exists( $sanitized_user_login ) ) {
303           $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered, please choose another one.' ) );