# PHP 7 安装

## PHP 7 安装

### [CentOS](https://www.centos.org/) 或 [RHEL](https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux) 推荐使用 Yum 安装

* PHP 5.6 版本: [PHP 5.6 on CentOS/RHEL 7.2 and 6.8 via Yum](https://webtatic.com/packages/php56/)
* PHP 7.0 版本:[PHP 7.0 on CentOS/RHEL 6.8 and 7.3 via Yum](https://webtatic.com/packages/php70/)
* PHP 7.1 版本: [PHP 7.1 on CentOS/RHEL 6.8 and 7.3 via Yum](https://webtatic.com/packages/php71/)

> 注意:5.6 7.0 7.1的源其实是一个

### [Ubuntu](http://www.ubuntu.org.cn/) 推荐使用apt -get 安装

> php7.0不支持Ubuntu 12.04版本及以下版本
>
> 注意:5.6 7.0 7.1的源其实是一个
>
> <https://launchpad.net/~ondrej/+archive/ubuntu/php-qa>

```
$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo add-apt-repository ppa:ondrej/php-qa
$ sudo apt-get update

# 安装php5.6
$ sudo apt-get install -y php5.6

# 安装php7.0
$sudo apt-get install -y php7.0

# 安装php7.1
$sudo apt-get install -y php7.1
```

#### 资料

* [How to Install PHP 5.6 or PHP 7.1 on Ubuntu 16.04, 14.04 or 12.04 using PPA](https://tecadmin.net/install-php5-on-ubuntu/#)
* [install-php-7-on-ubuntu](http://tecadmin.net/install-php-7-on-ubuntu/)
* [使用PPA在Ubuntu上安装php 5.4\~php 5.6 , php7](http://www.cnblogs.com/toughlife/p/5479325.html)
* [How to Install and Configure PHP 7.0 or PHP 7.1 on Ubuntu 16.04](https://www.vultr.com/docs/how-to-install-and-configure-php-70-or-php-71-on-ubuntu-16-04)

## PHP 各版本切换

### Ubuntu

假设您使用了以上方式在Ubuntu环境下安装了

* php5.6
* php7.0
* php7.1

> 以下例子只做了php5.6 与php7.0之前的切换, php7.1之间的切换雷同

```
从 php5.6 切换到 php7.0 :

# Apache:
$ sudo a2dismod php5.6 ; sudo a2enmod php7.0 ; sudo service apache2 restart

# CLI:
sudo update-alternatives --set php /usr/bin/php7.0
sudo update-alternatives --set phpize /usr/bin/phpize7.0
sudo update-alternatives --set php-config /usr/bin/php-config7.0

从 php7.0 切换到 php5.6 :

# Apache:
$ sudo a2dismod php7.0 ; sudo a2enmod php5.6 ; sudo service apache2 restart

# CLI:
sudo update-alternatives --set php /usr/bin/php5.6
sudo update-alternatives --set phpize /usr/bin/phpize5.6
sudo update-alternatives --set php-config /usr/bin/php-config5.6

从 php7.0 切换到 php7.1 :

# Apache:
sudo a2dismod php7.0 ; sudo a2enmod php7.1; sudo service apache2 restart

# CLI:
sudo update-alternatives --set php /usr/bin/php7.1
sudo update-alternatives --set phpize /usr/bin/phpize7.1
sudo update-alternatives --set php-config /usr/bin/php-config7.1
```


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