Set a response header, either replacing a prior set header, or appending the new header value, depending on $replace.
-If no $header_value is specified, or $header_value is ```NULL```, then a previously set header with the same key will be deleted from the list.
+If no $header_value is specified, or $header_value is NULL, then a previously set header with the same key will be deleted from the list.
-If $response_code is not ```0```, the response status code is updated accordingly.
+If $response_code is not 0, the response status code is updated accordingly.
## Parameters:
-* ```string $header_name```, the name of the response header.
-* Optional ```mixed $header_value```, the header value.
-* Optional ```int $response_code```, any HTTP response status code to set.
-* Optional ```bool $replace```, whether to replace a previously set response header with the same name.
+* string $header_name, the name of the response header.
+* Optional mixed $header_value, the header value.
+* Optional int $response_code, any HTTP response status code to set.
+* Optional bool $replace, whether to replace a previously set response header with the same name.
## Returns:
-* ```bool``` Success.
+* bool Success.