Backend DevelopmentPHP7Detailed tutorial on Linux (Ubuntu) installation and perfect uninstallation of PHP7Detailed tutorial on Linux (Ubuntu) installation and perfect uninstallation of PHP7
推荐（免费）：PHP7
一、安装
我第一次安装php的时候没有安装apache的php模块，结果apache不能解析php文件，访问文件显示的是源码。
一个命令搞定：安装php7和apache的php7模块：
apt-get install php7.0 libapache2-mod-php7.0
重启apache：
/etc/init.d/apache2 restart
在/var/www/html目录下新建文件info.php
内容如下：
<?php
phpinfo()?>
访问：http://你的主机IP/info.php
看到这个表示php7安装ok。
查看php7相关组件：apt-cache search php7
安装两个重要的组件，特别是php7.0-mysql，使php7获得mysql的支持
apt-get install php7.0-mysql php7.0-gd
二、卸载(第一种)
sudo apt-get - -purge remove libapache2-mod-php7.0 php7.0 php7.0-gd php7.0-mysql （安装了哪些组件就跟上名字，我这里只安装了这4个） sudo apt-get autoremove php7.0
三，卸载(第二种)
sudo aptitude purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "`
查询，卸载已安装php，就卸载完了。
(如果aptitude命令报错就安装aptiude：apt-get install aptitude)
如果想要安装其他php版本：
添加支持源
add-apt-repository ppa:ondrej/php
接下来就apt-get安装就好了
四、php打开session支持
在php.ini里找到session.auto_start = 0（我新安装的php5默认值就是0），把0改为1就可以了。
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