在Linux环境下安装了lnmp集成环境（Linux-nginx-MySQL-PHP），运行php后端接口程序，请求接口页面空白，不知道哪里出了问题。
定位问题
首先排除nginx配置文件的问题，nginx -t没有异常。
然后在代码运行目录’/home/wwwroot/carapi/public’下的框架入口文件index.php中插入调试代码
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echo 1;die;
页面成功显示1。php也正常，看来像是框架的问题。
但是框架的debug模式也打开了，但是页面没有任何错误提示，原来是需要在 php.ini 中打开错误显示。
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vim /usr/local/php/etc/php.ini
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display_errors = On
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lnmp restart
这下错误显示出来了
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Warning: require_once(): open_basedir restriction in effect. File(/home/wwwroot/carapi/vendor/autoload.php) is not within the allowed path(s): (/home/wwwroot/carapi/public/:/tmp/:/proc/) in /home/wwwroot/carapi/public/init.php on line 13
Warning: require_once(/home/wwwroot/carapi/vendor/autoload.php): failed to open stream: Operation not permitted in /home/wwwroot/carapi/public/init.php on line 13
Fatal error: require_once(): Failed opening required '/home/wwwroot/carapi/public/../vendor/autoload.php' (include_path='.:/usr/local/php/lib/php') in /home/wwwroot/carapi/public/init.php on line 13
有了错误信息，就好解决了
解决办法
因为nginx中配置的网站根目录是/home/wwwroot/carapi/public，所以在获取public之外的目录文件时出错。
只要修改open_basedir，增加/home/wwwroot/carapi/目录就可以了。
lnmp的nginx配置文件
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vim /usr/local/nginx/conf/fastcgi.conf
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fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REQUEST_SCHEME $scheme;
fastcgi_param HTTPS $https if_not_empty;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root/:/tmp/:/proc/";
对最后一行的open_basedir进行修改：
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fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root/:/tmp/:/proc/:/home/wwwroot/carapi/";
然后重启服务，接口就可以正常访问了。
