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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 |
|---|---|
| 1404 | |
| 1405 | if ( empty($user_login) ) |
| 1406 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1407 | |
| 1408 | if ( !$update && username_exists( $user_login ) ) |
| 1409 | return new WP_Error('existing_user_login', __('This username is already registered.') ); |
| 1410 | |
| 1411 | if ( empty($user_nicename) ) |
| 1412 | $user_nicename = sanitize_title( $user_login ); |
| 1413 | $user_nicename = apply_filters('pre_user_nicename', $user_nicename); |
| 1414 | |
| 1415 | if ( empty($user_url) ) |
| 1416 | $user_url = ''; |
| 1417 | $user_url = apply_filters('pre_user_url', $user_url); |
| 1418 | |
| 1419 | if ( empty($user_email) ) |
| 1420 | $user_email = ''; |
| 1421 | $user_email = apply_filters('pre_user_email', $user_email); |
| 1422 | |