ubuntu中l(wèi)ocalhost能訪(fǎng)問(wèn)php和html文件，但是127.0.0.1只能訪(fǎng)問(wèn)html，php變?yōu)橄螺d文件？

1，nginx配置文件：

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
    worker_connections 768;
    # multi_accept on;
}

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    # server_tokens off;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ##
    # SSL Settings
    ##

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
    ssl_prefer_server_ciphers on;

    ##
    # Logging Settings
    ##

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    gzip on;
    gzip_disable "msie6";

    # gzip_vary on;
    # gzip_proxied any;
    # gzip_comp_level 6;
    # gzip_buffers 16 8k;
    # gzip_http_version 1.1;
    # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    ##
    # Virtual Host Configs
    ##

    server {
        listen 80;
        server_name localhost;
        root /var/www/html;
        index index.html index.html index.php;

        location ~ \.php$ {
            root /var/www/html;
            fastcgi_index index.php;
            fastcgi_pass 127.0.0.1:9000;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            fastcgi_intercept_errors on;
            include fastcgi_params;
        }

        location = /favicon.ico {
            log_not_found off;
        }
    }

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}


#mail {
#   # See sample authentication script at:
#   # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#   # auth_http localhost/auth.php;
#   # pop3_capabilities "TOP" "USER";
#   # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#
#   server {
#       listen     localhost:110;
#       protocol   pop3;
#       proxy      on;
#   }
#
#   server {
#       listen     localhost:143;
#       protocol   imap;
#       proxy      on;
#   }
#}
          

2，/etc/hosts文件：

127.0.0.1    localhost
127.0.1.1    dp

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

3，php文件代碼：

    <?php
    header("Content-Type:text/html;charset=utf-8");
    $mysqli = mysqli_init();
    $mysqli->set_charset('utf8');
    $conn = $mysqli->real_connect('127.0.0.1','root','123456','test');

    if(!$conn){
        echo $mysqli->connect_error;
    }

    $obj = $mysqli->query("select * from info");
    $arr = $obj->fetch_all();
    echo '<pre>';
    var_dump($arr);
    echo '</pre>';
    echo '張三';

共出現(xiàn)了兩個(gè)問(wèn)題：
1，如題
2，在php代碼中，使用localhost鏈接數(shù)據(jù)庫(kù)就不行，但是使用127.0.0.1就行
請(qǐng)問(wèn)這個(gè)是什么原因呢？