$_SERVER 中没有PATH_INFO ，

会不会和之前那个 RewriteRule 写成这样有关？

RewriteRule ^(.*)$ /restful/index.php?/$1 [L]

下面是 $_SERVER里面的东西

Array
(
    [PATH] => /sbin:/bin:/usr/sbin:/usr/bin
    [SCRIPT_NAME] => /restful/index.php
    [REQUEST_URI] => /restful/articles
    [QUERY_STRING] => /articles
    [REQUEST_METHOD] => GET
    [SERVER_PROTOCOL] => HTTP/1.1
    [GATEWAY_INTERFACE] => CGI/1.1
    [REDIRECT_QUERY_STRING] => /articles
    [REDIRECT_URL] => /restful/articles
    [REMOTE_PORT] => 55634
    [SCRIPT_FILENAME] => /web/restful/index.php
    [SERVER_ADMIN] => you@example.com
    [CONTEXT_DOCUMENT_ROOT] => /web
    [CONTEXT_PREFIX] => 
    [REQUEST_SCHEME] => http
    [DOCUMENT_ROOT] => /web
    [REMOTE_ADDR] => 192.168.33.1
    [SERVER_PORT] => 80
    [SERVER_ADDR] => 192.168.33.10
    [SERVER_NAME] => api.com
    [SERVER_SOFTWARE] => Apache/2.4.25 (Unix) mod_fcgid/2.3.9
    [SERVER_SIGNATURE] => 
    [HTTP_ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
    [HTTP_ACCEPT_ENCODING] => gzip, deflate, sdch
    [HTTP_ACCEPT] => */*
    [CONTENT_TYPE] => multipart/form-data
    [HTTP_USER_AGENT] => Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36
    [HTTP_CACHE_CONTROL] => no-cache
    [HTTP_POSTMAN_TOKEN] => 6b837694-964d-bf4c-6d13-2008d7af5c66
    [HTTP_CONNECTION] => close
    [HTTP_HOST] => api.com
    [REDIRECT_STATUS] => 200
    [FCGI_ROLE] => RESPONDER
    [PHP_SELF] => /restful/index.php
    [REQUEST_TIME_FLOAT] => 1491920639.0935
    [REQUEST_TIME] => 1491920639
)