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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 |
|---|---|
| 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', $first_name); |
| 1305 | |
| 1306 | if ( empty($last_name) ) |
| 1307 | $last_name = ''; |
| 1308 | $last_name = apply_filters('pre_user_last_name', $last_name); |
| 1309 | |