Parses str as if it
were the query string passed via an URL and sets variables in
the current scope. If the second parameter arr is present, variables are stored
in this variable as an array elements instead.
注: Support for the optional second parameter was added in PHP 4.0.3.
注: To get the current QUERY_STRING, you may use the variable $_SERVER['QUERY_STRING']. Also, you may want to read the section on variables from outside of PHP.
See also parse_url(),
pathinfo(),
set_magic_quotes_runtime(), and
urldecode().