ubuntu discuz mysqli_connect() 不支持 advice_mysqli_connect的解决方法

对于服务器的安装我就不多说了，安装phpmyadmin这个mysql管理也很简单，直接拷贝源文件到网站所在目录，浏览器输入地址即可。详细的方法在这里。

http://blog.csdn.net/wang_shuai_ww/article/details/50440218

下面说说安装论坛或者网站时，数据库不能链接的问题。

首先参考网友的一篇文章：http://blog.csdn.net/hanshileiai/article/details/45580001

Nginx Installation

Nginx is one of the robust web server in Linux world. Nginx is a free, open source, high performance HTTP server and reverse proxy, as weell as an IMAP/POP3 proxy server. Now, we are going to install Nginx web server.

First, make sure system is upto date:
$ sudo apt-get update
$ sudo apt-get upgrade

#1 - Download and Install Nginx

The easiest way to download and install Nginx is using apt-get command. Here is the command:
$ sudo apt-get install nginx

Fig.01: Download and Install Nginx on Ubuntu Linux

Just wait until installation is get done on the system.

#2 - Test Nginx

Once it get done, you can open your browser and type url http://localhost or http://your_ip_address to test it. If everything goes normal, you will see Nginx welcome page:

Fig.02: Welcome nginx page on Ubuntu Linux

MySQL Installation On Ubuntu

MySQL is one of the most powerful database management system in Linux world. Next, we are going to install it with PHP support.

#1 - Install MySQL and PHP support

Type the following command:
$ sudo apt-get install mysql-server php5-mysql

Fig.03: Ubuntu Linux Install MySQL to Manage Site Data with PHP

During the installation, MySQL will ask you to enter MySQL root password, other wise the installation will not continue. Type the password you want, then press OK to continue the installation.

#2 - Test MySQL

Once mysql installation finished, we can test it. Open your console and type the following command:
$ mysql -u root -p

Fig.04: Ubuntu test Mysql installation

If you type your password correctly, the you will see the mysql prompt.

#3 - Securing access to MySQL

If we are going to use MySQL as a production database, we may want to secure it. MySQL provides a shell script to help us securing it. Just type the following command on your console:
$ sudo mysql_secure_installation
Here are the steps to do it.

1. Enter your root password

Enter your current root password to continue to the next step.

Fig.05: MySQL enter your root db password

2.Change the root password

If you want to change it, press Y. Otherwise, press N.

Fig.06: MySQL security

3.Remove anonymous user

It is recommended to remove anonymous user to mitigate risk who can log in into your database.

Fig.07: MySQL security

4.Disallow root login remotely

To make sure that no one remote your database as root from another machines, we need to disallow root login remotely.

Fig.08: MySQL security

5.Remove test database

Sometimes some MySQL installation will create a database named ëtestí for testing purpose. We can remove it if we donít use it.

Fig.09: MySQL security

6.Reload privilege tables

Then we need to reloading the privilege tables to ensure all changes made so far will take effect immediately.

Fig.10: MySQL security

7.Done

Fig.11: MySQL security

PHP Installation For Server Side Scripting

Since PHP is popular, a lot of websites is built using PHP language. As of January 2013, PHP was installed on more than 240 millions websites. Now we are going to install PHP on Ubuntu 14.04

#1 - Download and install PHP

As usual, we can download and install PHP using apt-get command. Just type the following command on your Ubuntu console or over the ssh based session:
$ sudo apt-get install php5-fpm

Fig.12: Install PHP for Server Side Processing on Ubuntu

And wait for the installation to complete.

Configure Nginx to work with PHP and MySQL Server on Ubuntu

Now we have all components installed. The next step is we need to configure Nginx with PHP and MySQL. Let's start to configure them.

#1 - Configure PHP5-FPM

PHP5-FPM configuration file is located at /etc/php5/fpm/php.ini. Open it with your text editor
$ sudo vi /etc/php5/fpm/php.ini
Change this parameter, from:
cgi.fix_pathinfo=1
to:
cgi.fix_pathinfo=0
Save and close the file and then restart php5-fpm service, type:
$ sudo service php5-fpm restart

#2 - Configure Nginx

Nginx configuration file is located at /etc/nginx/nginx.conf. But basically, we don't need to touch it. The configuration of nginx website is located in /etc/nginx/sites-available/default file.

解决nginx打开php文件总是显示下载框的问题

ps: 不同版本路径可能有变：如下 nginx 配置路径 
sudo vi /etc/nginx/sites-available/default
Open it, and uncomment lines:

 location ~ \.php$ {
         fastcgi_split_path_info ^(.+\.php)(/.+)$;
 #       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
 #
 #       # With php5-cgi alone:
 #        fastcgi_pass 127.0.0.1:9000;
 #       # With php5-fpm:
         fastcgi_pass unix:/var/run/php5-fpm.sock;
         fastcgi_index index.php;
         include fastcgi_params;
 }

Then restart the services.
$ sudo service nginx restart
Please make sure, on Ubuntu 14.04, we cannot use fastcgi_pass 127.0.0.1:9000. So make sure that the line is commented. Otherwise, on my machine, I got this error :
$ tail /var/log/nginx/error.log
2014/11/04 16:57:04 [emerg] 3216#0: "fastcgi_pass" directive is not allowed here in /etc/nginx/sites-enabled/default:59
2014/11/04 16:58:21 [emerg] 3256#0: "fastcgi_pass" directive is not allowed here in /etc/nginx/sites-enabled/default:59

On Ubuntu 14.04, I use the following line:
fastcgi_pass unix:/var/run/php5-fpm.sock
When I restart the Nginx and I still got the following error message:

2014/11/04 17:02:05 [emerg] 3295#0: "fastcgi_pass" directive is not allowed here in /etc/nginx/sites-enabled/default:61
2014/11/04 17:04:58 [emerg] 3410#0: "fastcgi_pass" directive is not allowed here in /etc/nginx/sites-enabled/default:61

Please make sure that you already uncomment this line:
location ~ \.php$ {

#3 - Configure MySQL

After the configuration section is done, now we need to test them to make sure that our configuration is working as required. On Ubuntu 14.04 the root document folder is located in /usr/share/nginx/html. So create a file called /usr/share/nginx/html/phpinfo.php with the following code:

 phpinfo();?> 

After restarting PHP-FPM and Nginx, open the browser and browse to the php file, we got only a blank screen. No error message on the screen. No error message on PHP-FPM and Nginx log file.

Then we changed /usr/share/nginx/html/phpinfo.php file code on the root document of Nginx, as follows:

 phpinfo();?> 

And then open the browser again and type url http://your_ip_address/phpinfo.php

It seem that by default, we can not use short php-tag like this:

   ... your code ... ?>  

To enable short php tag, we need to change the value of short_open_tag parameter on php.ini file:

Change the value from Off to On. Then restart your php5-fpm :
sudo service php5-fpm restart
Then try again to test your phpinfo file. Next, we will see if the MySQL support is enabled or not. Scroll down the php configuration screen on your browser, if you see MySQL block there, then MySQL support already enabled.

You are now ready to use Nginx, PHP5 and MySQL on Ubuntu server. I hope this quick article help anyone who wish to install Linux, Nginx, PHP and MySQL on Ubuntu 14.04.

上面是英文的，不过还是能看懂的吧。

上面的方法执行过后并不能解决我的问题，什么都安装完了，还是不行。几经周折，总算是找到问题所在了，一般这个情况都是mysql.so、mysqli.so、pdo_mysql.so这三个文件没连接到出问题了也就是说php.ini配置有问题，关键是就是extension_dir和extension这两个参数的设置，extension_dir设置为mysql.so、mysqli.so、pdo_mysql.so所在的目录，不同的机器和版本路径可能不同，电脑中使用locate搜索一下，或者find命令，找到后在php.ini中设置即可，如下：

extension_dir = "/usr/lib/php5/20121212/"

extension=mysql.so
extension=mysqli.so
extension=pdo_mysql.so

设置完成后重启php-fpm即可了。

注意如果服务器中安装了php-cgi和php-fpm那么php.ini会有两个，具体使用哪个要看/etc/nginx/sites-available/default文件中的下面部分：

location ~ \.php$ {
		try_files $uri =404; #增加
		fastcgi_split_path_info ^(.+.php)(/.+)$; #反注释
	#	include snippets/fastcgi-php.conf;
	#
	#	# With php5-cgi alone:
	#	fastcgi_pass 127.0.0.1:9000;
		fastcgi_index index.php;
	#	# With php5-fpm:
		fastcgi_pass unix:/var/run/php5-fpm.sock;
	#	fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		include fastcgi_params;
	}

注意这两个：

fastcgi_pass unix:/var/run/php5-fpm.sock;
# fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

只能使用其中一个，如果使用下面的，那么fastcgi_pass 127.0.0.1:9000;需要打开，而fastcgi_split_path_info ^(.+.php)(/.+)$; 这行需要注释掉。

我使用是第一个，也就是fpm方式，如果使用cgi方式还需要一个命令开启cgi服务：spawn-fcgi -a 127.0.0.1 -p 9000 -C 10 -u www-data -f /usr/bin/php5-cgi。