修改一段代码

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if($_POST['submit'] != NULL){
$url=$_POST['url'];

去掉上面的if判断，直接使用$url = $GET['url']
你自己判断下$GET['url']的合法性就OK了。

function modify_build_url($params = array(), $url = NULL) {		//my_debug(current_url());		if (! $url) {			$url = $_SERVER ['REQUEST_URI'];		}		$parts = parse_url ( $url );		if (! is_array ( $parts )) {			$parts = array ();		}		if (! array_key_exists ( 'host', $parts )) {			$parts ['host'] = $_SERVER ['HTTP_HOST'];		}				$gets = array ();		if (array_key_exists ( 'query', $parts )) {			$query = $parts ['query'];			parse_str ( $query, $gets );		}		if (! is_array ( $params )) {			$params = array ();		}		if (! is_array ( $gets )) {			$gets = array ();		}		foreach ( $params as $k => $v ) {			$gets [$k] = $v;		}		$path = null;		if (array_key_exists ( 'path', $parts )) {			$path = $parts ['path'];		}		if (! $path) {			$path = "/";		}		$ret = sprintf ( "http://%s%s?%s", $parts ['host'], $path, http_build_query ( $gets ) );		return $ret;	}