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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 |
|---|---|
| 128 | if ( !$update && username_exists( $user_login ) ) |
| 129 | return new WP_Error('existing_user_login', __('This username is already registered.') ); |
| 130 | |
| 131 | if ( empty($user_nicename) ) |
| 132 | $user_nicename = sanitize_title( $user_login ); |
| 133 | $user_nicename = apply_filters('pre_user_nicename', $user_nicename); |
| 134 | |
| 135 | if ( empty($user_url) ) |
| 136 | $user_url = ''; |
| 137 | $user_url = apply_filters('pre_user_url', $user_url); |
| 138 | |
| 139 | if ( empty($user_email) ) |
| 140 | $user_email = ''; |
| 141 | $user_email = apply_filters('pre_user_email', $user_email); |
| 142 | |
| 143 | if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) ) |
| 144 | return new WP_Error('existing_user_email', __('This email address is already registered.') ); |
| 145 | |
| 146 | if ( empty($display_name) ) |