升级的步骤:参考https://www.digitalocean.com/community/questions/how-to-upgrade-from-php-v-5-5-9-to-v-5-6

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php5.6 php5.6-mbstring php5.6-mcrypt php5.6-mysql php5.6-xml

(进行到这步的时候,php5.6就已经装好了,dpkg --get-selections | grep -v deinstall | grep php查看一下,可以看到后面的截图的效果!)


sudo a2dismod php5 

(这个好像是移除php5的)
sudo a2enmod php5.6
sudo service apache2 restart

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dpkg --get-selections | grep -v deinstall | grep php

用这个命令去看安装在你的服务器上的php的包,

You can also use dpkg --get-selections | grep -v deinstall | grep php command to see the PHP packages installed on your server to add them for PHP 5.6 if necessary.

ubuntu 14.04升级PHP5.5.9 到5.6

 php进程还没有启动起来

ubuntu 14.04升级PHP5.5.9 到5.6

ubuntu 14.04升级PHP5.5.9 到5.6

 

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