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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 |
|---|---|
| 1246 | if ( ! validate_username( $username ) ) { |
| 1247 | return new WP_Error( |
| 1248 | 'rest_user_invalid_username', |
| 1249 | __( 'Username contains invalid characters.' ), |
| 1250 | array( 'status' => 400 ) |
| 1251 | ); |
| 1252 | } |
| 1253 | |
| 1254 | /** This filter is documented in wp-includes/user.php */ |
| 1255 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1256 | |
| 1257 | if ( in_array( strtolower( $username ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 1258 | return new WP_Error( |
| 1259 | 'rest_user_invalid_username', |
| 1260 | __( 'Sorry, that username is not allowed.' ), |
| 1261 | array( 'status' => 400 ) |
| 1262 | ); |
| 1263 | } |
| 1264 | |