php分割url，获取参数query

#测试网址: http://localhost/blog/testurl.php?id=5

//获取域名或主机地址
echo $_SERVER['HTTP_HOST']." "; #localhost

//获取网页地址
echo $_SERVER['PHP_SELF']." "; #/blog/testurl.php

//获取网址参数
echo $_SERVER["QUERY_STRING"]." "; #id=5

//获取用户代理
echo $_SERVER['HTTP_REFERER']." ";

//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];

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解析url$url = 'https://www.sogou.com/sogou?dd=ddvalue&_asf=www.sogou.com&_ast=1565685988&w=01111xxx29900';

$arr = parse_url($url); //parse_url和parse_str看清楚了，略坑
echo json_encode($arr) .' ';echo $arr['query'] .' ';

输出如下
{"scheme":"https","host":"www.sogou.com","path":"/sogou","query":"dd=ddvalue&_asf=www.sogou.com&_ast=1565685988&w=01111xxx29900"}

dd=ddvalue&_asf=www.sogou.com&_ast=1565685988&w=01111xxx29900

如果想获取获取具体参数对$arr['query']进一步分割
$queryParts = explode('&', $arr['query'