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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 |
|---|---|
| 1339 | if ( empty($user_email) ) |
| 1340 | $user_email = ''; |
| 1341 | $user_email = apply_filters('pre_user_email', $user_email); |
| 1342 | |
| 1343 | if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) ) |
| 1344 | return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) ); |
| 1345 | |
| 1346 | if ( empty($nickname) ) |
| 1347 | $nickname = $user_login; |
| 1348 | $nickname = apply_filters('pre_user_nickname', $nickname); |
| 1349 | |
| 1350 | if ( empty($first_name) ) |
| 1351 | $first_name = ''; |
| 1352 | $first_name = apply_filters('pre_user_first_name', $first_name); |
| 1353 | |
| 1354 | if ( empty($last_name) ) |
| 1355 | $last_name = ''; |
| 1356 | $last_name = apply_filters('pre_user_last_name', $last_name); |
| 1357 | |