切换PHP版本
sudo update-alternatives --config PHP
过程如下
root@JD:/var/www/bbs# PHP -v
PHP 7.4.1 (cli) (built: Dec 18 2019 14:44:22) ( NTS )
copyright (c) The PHP Group
Zend Engine v3.4.0, copyright (c) Zend Technologies
with Zend OPcache v7.4.1, copyright (c), by Zend Technologies
root@JD:/var/www/bbs# ^C
root@JD:/var/www/bbs# sudo update-alternatives --config PHP
There are 2 choices for the alternative PHP (providing /usr/bin/PHP).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/PHP7.4 74 auto mode
1 /usr/bin/PHP7.3 73 manual mode
2 /usr/bin/PHP7.4 74 manual mode
Press <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/bin/PHP7.3 to provide /usr/bin/PHP (PHP) in manual mode
root@JD:/var/www/bbs# service PHP7.3-fpm restart
root@JD:/var/www/bbs# service Nginx restart
root@JD:/var/www/bbs# PHP -v
PHP 7.3.13-1+ubuntu18.04.1+deb.sury.org+1 (cli) (built: Dec 18 2019 14:48:49) ( NTS )
copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.13, copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.13-1+ubuntu18.04.1+deb.sury.org+1, copyright (c) 1999-2018, by Zend Technologies
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