PHP中URL字符串与关联数组的互相转换

$data = array(
'apikey'=>'xg6tr7k',
'user'=>'abcd',
'email'=>'root@example.com'
);
echo http_build_query($data);

apikey=xg6tr7k&user=abcd&email=root%40example.com

$query_string ="http://www.A.com/index.php?apikey=xg6tr7k&user=abcd&email=jhon.php%40example.com";
$parsed_url = parse_url($query_string);
print_r($parsed_url);

Array
(
    [scheme] => http
    [host] => www.A.com
    [path] => /index.php
    [query] => apikey=xg6tr7k&user=abcd&email=jhon.php%40example.com
)