PHP

Switch PHP Versions

sudo update-alternatives --config php

Security

Hide PHP Version

Bitnami WordPress

sudo php -i | grep "Loaded Configuration File"
sudo php -i | grep "expose_php"
sudo nano /opt/bitnami/php/etc/php.ini
expose_php => Off
sudo /opt/bitnami/ctlscript.sh restart apache

How to hide the PHP version in nginX

php_info File

<?php
phpinfo();
?>

HOWTO: Fix Error: failed to execute shell

Error...

failed to execute shell: bash -c /usr/share/lighttpd/create-mime.assign.pl: No such file or directory
failed to execute shell: bash -c /usr/share/lighttpd/include-conf-enabled.pl: No such file or directory

Reason...

Because the Ubuntu Release Upgrader has removed PHP during the upgrade process. God knows why.

Solution...

Reinstall the PHP CGI module and the PHP MySQL module.

Fix...

sudo apt-get install php-cgi php-mysql
sudo lighty-enable-mod fastcgi-php
sudo service lighttpd restart

FIX: Error: Unable to Load Dynamic Library

Error...

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/dom.so' - /usr/lib/php/20160303/dom.so: undefined symbol: php_libxml_node_free_list in Unknown on line 0

Fix...

sudo apt-get install --reinstall `dpkg -l | grep 'ii  php7' | awk '{ printf($2" "); next}'`

openSSL Check

echo '<?php phpinfo(); ?>' | php 2>&1 |grep -i ssl

PEAR

Installation

sudo apt-get install php-pear

Error: requires PEAR Installer

requires PEAR Installer (version >= 1.10.1), installed version is 1.9.4

The fix is below...

Upgrade

sudo -i
pear upgrade --force --alldeps http://pear.php.net/get/PEAR-1.10.1
pear clear-cache
pear update-channels
pear upgrade
pear upgrade-all

Thanks - https://superuser.com/a/1129953/287000

HOWTO: Secure Tighten PHP

sudo nano /etc/php5/apache2/php.ini /etc/php5/cgi/php/ini

Change the following lines as the following :

display_errors = Off
log_errors = On
allow_url_fopen = Off
safe_mode = On
expose_php = Off
enable_dl = Off
disable_functions = system, show_source, symlink, exec, dl, shell_exec, passthru, phpinfo, escapeshellarg, escapeshellcmd

Thanks - http://secure-ubuntu-server.blogspot.co.uk/2009/07/howto-hardening-your-apache-and-php-on_07.html

HOWTO: Install Latest PHP 7.x On Ubuntu 20.04 LTS

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.4-imagick php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-fpm php7.4-gd php7.4-intl php7.4-json php7.4-mysql php7.4-readline php7.4-xml php7.4-mbstring php7.4-zip
sudo apt-get -y install php7.4-imagick php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-fpm php7.4-gd php7.4-intl php7.4-json php7.4-mysql php7.4-readline php7.4-xml php7.4-mbstring php7.4-zip

HOWTO: Upgrade To Latest PHP 7.x On Ubuntu 18.04 LTS

7.4

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.4-common php7.4-imagick php7.4-bcmath php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-gd php7.4-intl php7.4-json php7.4-mbstring php7.4-mysql php7.4-opcache php7.4-readline php7.4-xml php7.4-zip
sudo apt-get -y install php7.4-common php7.4-imagick php7.4-bcmath php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-gd php7.4-intl php7.4-json php7.4-mbstring php7.4-mysql php7.4-opcache php7.4-readline php7.4-xml php7.4-zip

7.3

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.3-imagick php7.3-cgi php7.3-cli php7.3-common php7.3-curl php7.3-fpm php7.3-gd php7.3-json php7.3-mysql php7.3-readline php7.3-xml php7.3-mbstring php7.3-zip
sudo apt-get -y install php7.3-imagick php7.3-cgi php7.3-cli php7.3-common php7.3-curl php7.3-fpm php7.3-gd php7.3-json php7.3-mysql php7.3-readline php7.3-xml php7.3-mbstring php7.3-zip

HOWTO: Upgrade To PHP 7.x On Ubuntu 16.04 LTS

7.4

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.4-imagick php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mysql php7.4-readline php7.4-xml php7.4-mbstring php7.4-zip
sudo apt-get -y install php7.4-imagick php7.4-cgi php7.4-cli php7.4-common php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mysql php7.4-readline php7.4-xml php7.4-mbstring php7.4-zip

7.3

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.3-imagick php7.3-cgi php7.3-cli php7.3-common php7.3-curl php7.3-fpm php7.3-gd php7.3-json php7.3-mysql php7.3-readline php7.3-xml php7.3-mbstring php7.3-zip
sudo apt-get -y install php7.3-imagick php7.3-cgi php7.3-cli php7.3-common php7.3-curl php7.3-fpm php7.3-gd php7.3-json php7.3-mysql php7.3-readline php7.3-xml php7.3-mbstring php7.3-zip

HOWTO: Upgrade To PHP 7.2 On Ubuntu 14.04 LTS

THIS NO LONGER WORKS AS 14.04 IS END OF LIFE

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.2-cgi php7.2-cli php7.2-common php7.2-curl php7.2-gd php7.2-json php7.2-mysql php7.2-readline
sudo apt-get -y install php7.2-cgi php7.2-cli php7.2-common php7.2-curl php7.2-gd php7.2-json php7.2-mysql php7.2-readline

https://joshtronic.com/2017/03/26/upgrade-to-php-7x-on-ubunu-1404-lts

HOWTO: Upgrade To PHP 7.1 On Ubuntu 14.04 LTS

THIS NO LONGER WORKS AS 14.04 IS END OF LIFE

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -s remove
sudo apt list --installed php* 2>/dev/null | grep 'php' | sed 's/\/.*//' | xargs apt-get -y remove
sudo apt-get -s install php7.1-cgi php7.1-cli php7.1-common php7.1-curl php7.1-gd php7.1-json php7.1-mysql php7.1-readline
sudo apt-get -y install php7.1-cgi php7.1-cli php7.1-common php7.1-curl php7.1-gd php7.1-json php7.1-mysql php7.1-readline

https://joshtronic.com/2017/03/26/upgrade-to-php-7x-on-ubunu-1404-lts

HOWTO: Upgrade To PHP 5.6 On Ubuntu 14.04 LTS

THIS NO LONGER WORKS AS 14.04 IS END OF LIFE

php -v
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --installed php*
sudo apt-get -s install php5.6-cgi php5.6-cli php5.6-common php5.6-curl php5.6-gd php5.6-json php5.6-mysql php5.6-readline
sudo apt-get -y install php5.6-cgi php5.6-cli php5.6-common php5.6-curl php5.6-gd php5.6-json php5.6-mysql php5.6-readline
sudo reboot
php -v

HOWTO: Upgrade To PHP 5.5 On Ubuntu 12.04 LTS

THIS NO LONGER WORKS AS 12.04 IS END OF LIFE

sudo add-apt-repository ppa:ondrej/php5
sudo aptitude update
sudo aptitude -v -s safe-upgrade
sudo aptitude -v -y safe-upgrade
php --version

Thanks - https://joshtronic.com/2013/12/30/upgrade-php-5-3-php-5-5-ubuntu-12-04-lts/

HOWTO: Upgrade PHP 5.3 To PHP 5.4 On Ubuntu 12.04 LTS

THIS NO LONGER WORKS AS 12.04 IS END OF LIFE

sudo add-apt-repository ppa:ondrej/php5-oldstable
sudo aptitude update
sudo aptitude -v -s safe-upgrade
sudo aptitude -v -y safe-upgrade
php --version

Thanks - http://www.nicovs.be/install-php-5-4-on-ubuntu-12-04-lts

HOWTO: Install Extensions

Centos

pecl install zip