Downgrade PHP 7 to PHP 5.6 on Ubuntu
ubuntu16.04 系统源自带是7.0的，如何降级安装PHP 5.6呢 .?
apt-get install -y language-pack-en-base
LC_ALL=en_US.UTF-8 add-apt-repository ppa:ondrej/php
add-apt-repository ppa:ondrej/php
apt-get update
apt-cache search php5
apt-get install php5.6-common
apt-get install libapache2-mod-php5.6
如果需要解析xml apt-get install php5.6-xml
Warming：
apt-get install libapache2-mod-php5.6
libapache2-mod-php5.6: php7.0 module already enabled, not enabling PHP 5.6
apt-get install libapache2-mod-php5.6
php7.0 module already enabled, not enabling PHP 5.6update-alternatives --set php /usr/bin/php5.6
解决方法：
(shell执行切换为php5.6)
update-alternatives --set php /usr/bin/php5.6
php -v
PHP 5.6.29-1+deb.sury.org~xenial+1 (cli)
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
注释掉php7.0的相关库
/etc/apache2/mods-available/php7.0.load
# Conflicts: php5
#LoadModule php7_module /usr/lib/apache2/modules/libphp7.0.so
版本切换:
From php5.6 to php7.0 :
Apache:
sudo a2dismod php5.6 ; sudo a2enmod php7.0 ; sudo service apache2 restart
CLI:
update-alternatives --set php /usr/bin/php7.0
From php7.0 to 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