Source View: pre_user_display_name

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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
1287      if ( empty($user_email) )
1288           $user_email = '';
1289      $user_email = apply_filters('pre_user_email', $user_email);
1290
1291      if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) )
1292           return new WP_Error('existing_user_email', __('This email address is already registered.') );
1293
1294      if ( empty($display_name) )
1295           $display_name = $user_login;
1296      $display_name = apply_filters('pre_user_display_name', $display_name);
1297
1298      if ( empty($nickname) )
1299           $nickname = $user_login;
1300      $nickname = apply_filters('pre_user_nickname', $nickname);
1301
1302      if ( empty($first_name) )
1303           $first_name = '';
1304      $first_name = apply_filters('pre_user_first_name', $first_name);
1305