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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 1419 | if ( empty($user_email) ) |
| 1420 | $user_email = ''; |
| 1421 | $user_email = apply_filters('pre_user_email', $user_email); |
| 1422 | |
| 1423 | if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) ) |
| 1424 | return new WP_Error('existing_user_email', __('This email address is already registered.') ); |
| 1425 | |
| 1426 | if ( empty($display_name) ) |
| 1427 | $display_name = $user_login; |
| 1428 | $display_name = apply_filters('pre_user_display_name', $display_name); |
| 1429 | |
| 1430 | if ( empty($nickname) ) |
| 1431 | $nickname = $user_login; |
| 1432 | $nickname = apply_filters('pre_user_nickname', $nickname); |
| 1433 | |
| 1434 | if ( empty($first_name) ) |
| 1435 | $first_name = ''; |
| 1436 | $first_name = apply_filters('pre_user_first_name', $first_name); |
| 1437 | |