以下常數由擴充功能定義,因此只有在擴充功能被編譯到 PHP 中,或者在執行時被動態載入後才有效。
The following constants are meant to be used with parse_url() and are available since PHP 5.1.2.
PHP_URL_SCHEME
PHP_URL_HOST
PHP_URL_PORT
PHP_URL_USER
PHP_URL_PASS
PHP_URL_PATH
PHP_URL_QUERY
PHP_URL_FRAGMENT
PHP_QUERY_RFC1738
PHP_QUERY_RFC3986