php编写的urlencode代码：

function durlencode($url) {
	static $fix = array('%21', '%2A','%3B', '%3A', '%40', '%26', '%3D', '%2B', '%24', '%2C', '%2F', '%3F', '%25', '%23', '%5B', '%5D');
	static $replacements = array('!', '*', ';', ":", "@", "&", "=", "+", "$", ",", "/", "?", "%", "#", "[", "]");
	return str_replace($fix, $replacements, urlencode($url));
}