如何在Debian 8/7上使用PPA安装PHP 7.0和5.6

# 在系统中添加PPA
首先，您需要在您的系统上添加Dotdeb PPA。在添加PPA之前，首先导入Dotdeb存储库的GPG密钥。
```
$ sudo apt-get install curl
$ curl https://www.dotdeb.org/dotdeb.gpg | sudo apt-key add -
```
现在使用以下命令在系统中添加PPA。

首先，使用命令 `lsb_release -a` 查看Debian的版本号：
```
$ lsb_release -a
LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Debian
Description:    Debian GNU/Linux 8.10 (jessie)
Release:        8.10
Codename:       jessie
```

## Debian 8 Jessie
```
$ echo 'deb http://packages.dotdeb.org jessie all' >> /etc/apt/sources.list
$ echo 'deb-src http://packages.dotdeb.org jessie all' >> /etc/apt/sources.list
```
## Debian 7 Wheezy
```
$ echo 'deb http://packages.dotdeb.org wheezy all' >> /etc/apt/sources.list
$ echo 'deb-src http://packages.dotdeb.org wheezy all' >> /etc/apt/sources.list
```
# 安装PHP 7.0
使用以下命令集在PHP 7中为您的Ubuntu系统添加PPA并安装它。
```
$ sudo apt-get update
$ sudo apt-get install php7.0
```
现在使用以下命令检查您的系统上安装的php版本。
```
$ php -v

PHP 7.0.15-1~dotdeb+8.1 (cli) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.15-1~dotdeb+8.1, Copyright (c) 1999-2017, by Zend Technologies
```
# 安装PHP 5.6
使用以下命令集在Debian系统中为PHP 5.6添加PPA并安装它。
```
$ sudo apt-get update
$ sudo apt-get install php5
```
现在使用以下命令检查您的系统上安装的php版本。
```
$ php -v

PHP 5.6.29-0+deb8u1 (cli) (built: Dec 13 2016 16:02:08)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
```

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