PhP

https://www.linuxtuto.com/how-to-install-php-8-3-on-ubuntu-22-04/

https://www.cloudbooklet.com/developer/how-to-install-php-fpm-with-apache-on-ubuntu-22-04/

apt install php8.1-fpm

a2dismod php8.1
a2dismod mpm_prefork
a2enmod mpm_event proxy_fcgi setenvif
a2enconf php8.1-fpm
a2enmod http2

systemctl restart apache2

service php8.1-fpm restart

install php8.1
https://computingforgeeks.com/how-to-install-php-on-ubuntu-linux-system/

install php8.1-fpm + apache
https://www.cloudbooklet.com/how-to-install-php-fpm-with-apache-on-ubuntu-20-04/

 

If you just want to know how many workers are currently running, you can try with HTOP, do a htop and filter (F4) with “php-fpm”.

Or with ps

ps aux | grep "php-fpm: pool"

https://serverfault.com/questions/878096/how-to-check-current-pm-max-children-setting

Apache:

$ sudo a2dismod php5.6
$ sudo a2enmod php7.1
$ sudo service apache2 restart

Command Line:

$ sudo update-alternatives --set php /usr/bin/php7.1
$ sudo update-alternatives --set phar /usr/bin/phar7.1
$ sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.1

1. Similar for other environment
   • download and extract for cacert.pem here (a clean file format/data)

https://curl.haxx.se/docs/caextract.html

2. Put it here in the following directory.

C:\xampp\php\extras\ssl\cacert.pem

3. In your php.ini put this line in this section (“c:\xampp\php\php.ini”):

;;;;;;;;;;;;;;;;;;;;
; php.ini Options  ;
;;;;;;;;;;;;;;;;;;;;

curl.cainfo = "C:\wamp\bin\php\extras\ssl\cacert.pem"

4. Restart your webserver/apache
5. Problem solved!

isbandytas:
https://www.cloudbooklet.com/upgrade-php-version-to-php-7-4-on-ubuntu/

nebandytas, turi papildomu moduliu ir mysql+phpmyadmin
https://www.bennetrichter.de/en/tutorials/apache2-php7-mysql-phpmyadmin/

https://websiteforstudents.com/install-php-7-3-php-7-3-fpm-with-apache2-nginx-on-ubuntu-16-04-18-04-18-10/

what PHP version your Apache server is using, 
the output of phpinfo() is always what you should pay attention to

sudo a2dismod php7.1
sudo a2enmod php7.3
sudo service apache2 restart

https://www.ionos.com/community/hosting/php/install-and-use-php-composer-on-ubuntu-1604/

windows 10
https://devanswers.co/install-composer-php-windows-10/