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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 |
|---|---|
| 1328 | if ( !$update && username_exists( $user_login ) ) |
| 1329 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |
| 1330 | |
| 1331 | if ( empty($user_nicename) ) |
| 1332 | $user_nicename = sanitize_title( $user_login ); |
| 1333 | $user_nicename = apply_filters('pre_user_nicename', $user_nicename); |
| 1334 | |
| 1335 | if ( empty($user_url) ) |
| 1336 | $user_url = ''; |
| 1337 | $user_url = apply_filters('pre_user_url', $user_url); |
| 1338 | |
| 1339 | if ( empty($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) ) |