Install PHP

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DEBIAN  UBUNTU  MINT
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# PHP

 sudo apt update
 sudo apt install php php-cli php-fpm php-json php-pdo php-mysql php-zip php-gd  php-mbstring php-curl php-xml php-pear php-bcmath
 php -v
 
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CENTOS RHEL
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sudo dnf install php php-cli php-zip php-json ...
 
# COMPOSER

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '795f976fe0ebd8b75f26a6dd68f78fd3453ce79f32ecb33e7fd087d39bfeb978342fb73ac986cd4f54edd0dc902601dc') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
sudo mv ~/composer.phar /usr/local/bin/composer
chmod +x /usr/local/bin/composer
composer -V