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| sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php5.6
you can install more php5.6 module
sudo apt-get install php5.6-fpm php5.6-mbstring php5.6-mcrypt php5.6-mysql php5.6-xml php5.6-intl php-apcu php-uuid php5.6-cgi php5.6-cli php5.6-gd php5.6-ldap php5.6-sqlite3 php-uploadprogress libapache2-mod-php5.6
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php7.2与php5.6版本切换
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| a2dismod php7.2
a2enmod php5.6
systemctl restart apache2
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默认没有开启PHP 5.6 FPM，为了开启PHP 5.6 FPM，需要执行一下命令
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| a2enmod proxy_fcgi setenvif
a2enconf php5.6-fpm
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同时执行如下命令
最后重启apache
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| systemctl reload apache2
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以上命令是Apache上PHP版本切换的命令，下面是CLI端切换的命令
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| sudo update-alternatives --set php /usr/bin/php7.2
sudo update-alternatives --set phpize /usr/bin/phpize7.2
sudo update-alternatives --set php-config /usr/bin/php-config7.2
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