curl 选项，可以多次使用：

Headers for curl are set with the -H option, which can be used multiple times:

curl -H "Header-1: Value" -H "Header-2: Value" http://example.com

注意 PHP有一个 curl库。所以你不必使用 exec（）。

Note: If installed, PHP has a curl library. So you don't have to use exec().