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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 |
|---|---|
| 1311 | if ( !$update && username_exists( $user_login ) ) |
| 1312 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |
| 1313 | |
| 1314 | if ( empty($user_nicename) ) |
| 1315 | $user_nicename = sanitize_title( $user_login ); |
| 1316 | $user_nicename = apply_filters('pre_user_nicename', $user_nicename); |
| 1317 | |
| 1318 | if ( empty($user_url) ) |
| 1319 | $user_url = ''; |
| 1320 | $user_url = apply_filters('pre_user_url', $user_url); |
| 1321 | |
| 1322 | if ( empty($user_email) ) |
| 1323 | $user_email = ''; |
| 1324 | $user_email = apply_filters('pre_user_email', $user_email); |
| 1325 | |
| 1326 | if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) ) |
| 1327 | return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) ); |
| 1328 | |
| 1329 | if ( empty($nickname) ) |