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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 |
|---|---|
| 195 | * |
| 196 | * @param string $user_login User's username for logging in |
| 197 | * @param string $user_email User's email address to send password and add |
| 198 | * @return int|WP_Error Either user's ID or error on failure. |
| 199 | */ |
| 200 | function register_new_user($user_login, $user_email) { |
| 201 | $errors = new WP_Error(); |
| 202 | |
| 203 | $user_login = sanitize_user( $user_login ); |
| 204 | $user_email = apply_filters( 'user_registration_email', $user_email ); |
| 205 | |
| 206 | // Check the username |
| 207 | if ( $user_login == '' ) |
| 208 | $errors->add('empty_username', __('<strong>ERROR</strong>: Please enter a username.')); |
| 209 | elseif ( !validate_username( $user_login ) ) { |
| 210 | $errors->add('invalid_username', __('<strong>ERROR</strong>: This username is invalid. Please enter a valid username.')); |
| 211 | $user_login = ''; |
| 212 | } elseif ( username_exists( $user_login ) ) |
| 213 | $errors->add('username_exists', __('<strong>ERROR</strong>: This username is already registered, please choose another one.')); |