基本方法
$query = parse_url($url, PHP_URL_QUERY);// Returns a string if the URL has parameters or NULL if notif ($query) { $url .= '&category=1';} else { $url .= '?category=1';}更先进
$url = 'http://example.com/search?keyword=test&category=1&tags[]=fun&tags[]=great';$url_parts = parse_url($url);// If URL doesn't have a query string.if (isset($url_parts['query'])) { // Avoid 'Undefined index: query' parse_str($url_parts['query'], $params);} else { $params = array();}$params['category'] = 2; // Overwrite if exists$params['tags'][] = 'cool'; // Allows multiple values// Note that this will url_enpre all values$url_parts['query'] = http_build_query($params);// If you have pecl_httpecho http_build_url($url_parts);// If notecho $url_parts['scheme'] . '://' . $url_parts['host'] . $url_parts['path'] . '?' . $url_parts['query'];如果不是类，则应至少将其放在函数中。
