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Update Php

Add repo ondrej 
 
sudo apt-get update
sudo apt -y install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo add-apt-repository ppa:ondrej/apache2
sudo apt-get update
Install php7.4 
 
sudo apt -y install php7.4

php -v
php.ini 
 
sudo gedit /etc/php/7.4/apache2/php.ini 

sudo diff -y -W 120 --suppress-common-lines 
    /etc/php/7.2/apache2/php.ini 
    /etc/php/7.4/apache2/php.ini
Install some commonly used extensions 
 
sudo apt install php7.4-common 
sudo apt install php7.4-mysql
sudo apt install php-curl
Enable php7.4 
 
sudo a2dismod php7.2
sudo a2enmod php7.4
Restart apache 
 
systemctl restart apache2

# sudo service apache2 restart
Switch php versions 
 
sudo a2dismod php7.4
sudo a2enmod php8.0
systemctl restart apache2

➥ Questions    
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30. Apache2
29 . Php7.4
Last update:   11-09-2021

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