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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 |
|---|---|
| 1089 | */ |
| 1090 | public function check_username( $value, $request, $param ) { |
| 1091 | $username = (string) $value; |
| 1092 | |
| 1093 | if ( ! validate_username( $username ) ) { |
| 1094 | return new WP_Error( 'rest_user_invalid_username', __( 'Username contains invalid characters.' ), array( 'status' => 400 ) ); |
| 1095 | } |
| 1096 | |
| 1097 | /** This filter is documented in wp-includes/user.php */ |
| 1098 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1099 | |
| 1100 | if ( in_array( strtolower( $username ), array_map( 'strtolower', $illegal_logins ) ) ) { |
| 1101 | return new WP_Error( 'rest_user_invalid_username', __( 'Sorry, that username is not allowed.' ), array( 'status' => 400 ) ); |
| 1102 | } |
| 1103 | |
| 1104 | return $username; |
| 1105 | } |
| 1106 | |
| 1107 | /** |