How to install Yii2 on ubuntu

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　　http://tutsnare.com/how-to-install-yii2-on-ubuntu/

How to install Yii2 on ubuntu using composer
　　Best way to install Yii Framework is using composer. Below we will
see installation steps of a php framework yii2 on ubuntu. Let’s see How to install yii2 on ubuntu using composer.Before composer install we need some more packages installation. In
this article (How to install Yii2 on ubuntu using composer) we will
explore step by step all the commands to make yii2 installation easy andneed to make yii2 install. You need to just run these commands step by
step via terminal.
　　Requirement :-
PHP >= 5.4
Some of packages installed :- curl, openssl, mcrypt etc.
　　Below are the steps of installing yii2 on ubuntu using composer:- first we need to install latest update and upgrade of ubuntu server. so for this run below command at your terminal.
sudo apt-get update
sudo apt-get upgrade　　After update we need to install php, apche, mysql (if not already installed)
　　Install php mysql and apache
sudo apt-get install apache2
sudo apt-get install php5
sudo apt-get install mysql-server
sudo apt-get install php5-mysql　　Now we need to install some of require extension (json, curl, mcrypt
etc.) to run and download yii2 framework. and then restart apache serverto setup all extension. May be you don’t need to all extension but it’ssometimes require extension you need.
#installing json extension
sudo apt-get install php5-json
#installing unzip extension
sudo apt-get install unzip
#installing curl extension
sudo apt-get install curl
#installing openssl extension
sudo apt-get install openssl
#installing mcrypt extension
sudo apt-get install php5-mcrypt
#enable mcrypt extension
sudo php5enmod mcrypt
#enable mod rewrite extension
sudo a2enmod rewrite
#php gd extension
sudo apt-get install php5-gd
#restarting apache
sudo service apache2 restart　　After successfully configure all php setup and require extension we
need to install composer to download yii2 from remote server. for this
first command will be for download composer using curl then second one
move composer to local user directory for make composer globally use.
# installing composer
curl -sS https://getcomposer.org/installer | php
# move composer globally
sudo mv composer.phar /usr/local/bin/composer
# check composer working
composer　　

　　Note :-
　　

　　if you need,please modify chinese source ,or it will be slow,if there is a ladder,you can skip，like this：
composer config -g repositories.packagist composer http://packagist.phpcomposer.com　　申请github token，其他项目也会用到，不然会看到
　　You'd better apply for a token GitHub, and other projects will be used, otherwise you will see：
Could not fetch https://api.github.com/repos/jquery/jquery, please create a GitHub OAuth token to go over the API rate limit
Head to https://github.com/settings/tokens/new?scopes=repo&description=Composer+on+mrgeneral-linux+2015-09-05+1450
to retrieve a token. It will be stored in "/home/chengxiaobai/.composer/auth.json" for future use by Composer.
Token (hidden)　　If you watch that when you installing composer,you will creating a token like that:

• 　　sign up a github account,then add one emali.
  
  
• 　　create a token:
  
  
  
  • 　　In the top right corner of any page, click your profile photo, then click Settings.
    
  • 　　In the user settings sidebar, click Personal access tokens.
    
  • 　　Click Generate new token.
    
  • 　　Give your token a descriptive name.
    
  • 　　Select the scopes you wish to grant to this token. The default scopes
    allow you to interact with public and private repositories, user data,
    and gis ts.
    
  • 　　Click Generate token.
    
  • 　　ce4249e2a0a817c22226bbc62e790ae3f6aaf5c4
    
    Personal access tokens
    　　Tokens you have generated that can be used to access the GitHub API.
    Make sure to copy your new personal access token now. You won’t be able to see it again!
    
  
  

　　If you thave already installed composer and it’s a old version you can update composer via below command
# updating composer
composer self-update　　Now we have composer installed successfully on our ubuntu. and then
we need to install yii2 on ubuntu. I am sharing steps below with
terminal command run screen-shots that how to install yii2 on ubuntu.
　　Now need to install Composer asset plugin first using composer.
Composer asset plugin allows managing bower and npm package
dependencies.
# install Composer asset plugin
composer global require "fxp/composer-asset-plugin:1.0.0"

　　Now run below command to install yii2. First i am going switch to my
preferred destination where i want to install yii2 so i am installing at/var/www/html/ directory.
Note:- During installation Composer may ask for your
Github login credentials. This is normal because Composer needs to get
enough API rate-limit to retrieve the dependent package information fromGithub.
　　更改composer 源(更改成https):
vim  ~/.composer/config.json

　　更改为:

# changing dir
cd /var/www/html/
# install yii2
composer create-project yiisoft/yii2-app-basic basic

　　You can also give your location at installation time see Full command of yii2 installation is there “–prefer-dist” means location where you want to install yii.
composer create-project --prefer-dist yiisoft/yii2-app-basic basic　　Now check your preferred location you have a new directory named
“basic” you can rename it. also you can rename basic to your-name at
installation time like below.
composer create-project --prefer-dist yiisoft/yii2-app-basic NewName　　Now you are done with how to install yii2 on ubuntu. and open url on http://localhost/basic/web/ and bam. Now you can enjoy a new php framework. you can get more about this on official site of yii framework and see what’s new features you are getting. you will really enjoy this php framework.
　　Note :- If you want to install the latest development version of Yii then you need to execute below command via terminal.