$ php -m[PHP Modules]bcmathbz2calendarCorectypecurldatedomexiffileinfofilterftpgdgettexthashiconvigbinaryjsonlibxmlmbstringmemcachedmsgpackopensslpcntlpcrePDOpdo_pgsqlpgsqlPharposixreadlineredisReflectionsessionshmopSimpleXMLsocketssodiumSPLstandardsysvmsgsysvsemsysvshmtokenizerwddxxmlxmlreaderxmlwriterxslZend OPcachezipzlib[Zend Modules]Zend OPcache

$dpkg -l | grep 'php'iilibapache2-mod-php7.27.2.15-0ubuntu0.18.04.2amd64server-side, HTML-embedded scripting language (Apache 2 module)iiphp1:7.2+60ubuntu1allserver-side, HTML-embedded scripting language (default)iiphp-auth-sasl1.0.6-3allAbstraction of various SASL mechanism responsesiiphp-cli-prompt 1.0.3+dfsg-1 alltiny helper prompting for user inputiiphp-common 1:60ubuntu1allCommon files for PHP packagesiiphp-composer-ca-bundle 1.1.0-1allutility library to find a path to the system CA bundleiiphp-composer-semver1.4.2-1allutilities, version constraint parsing and validationiiphp-composer-spdx-licenses 1.3.0-1allSPDX licenses list and validation libraryiiphp-igbinary 2.0.5-1build1amd64igbinary PHP serializeriiphp-json-schema5.2.6-1allimplementation of JSON schemaiiphp-mail 1.3.0-1allClass that provides multiple interfaces for sending emailsiiphp-memcached3.0.1+2.2.0-1build2amd64memcached extension module for PHP, uses libmemcachediiphp-msgpack2.0.2+0.5.7-2build1amd64PHP extension for interfacing with MessagePackiiphp-net-smtp 1.8.0-1allPHP PEAR module implementing SMTP protocoliiphp-net-socket 1.0.14-2 allNetwork Socket Interfaceiiphp-pear 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1 allPEAR Base Systemiiphp-psr-log1.0.2-1allcommon interface for logging librariesiiphp-redis3.1.6-1build1amd64PHP extension for interfacing with Redisiiphp-symfony-console3.4.6+dfsg-1ubuntu0.1allrun tasks from the command lineiiphp-symfony-debug3.4.6+dfsg-1ubuntu0.1alltools to make debugging of PHP code easieriiphp-symfony-filesystem 3.4.6+dfsg-1ubuntu0.1allbasic filesystem utilitiesiiphp-symfony-finder 3.4.6+dfsg-1ubuntu0.1allfind files and directoriesiiphp-symfony-polyfill-mbstring1.6.0-2allSymfony polyfill for the Mbstring extensioniiphp-symfony-process3.4.6+dfsg-1ubuntu0.1allexecute commands in sub-processesiiphp7.2 7.2.15-0ubuntu0.18.04.2allserver-side, HTML-embedded scripting language (metapackage)iiphp7.2-bcmath7.2.15-0ubuntu0.18.04.2amd64Bcmath module for PHPiiphp7.2-bz2 7.2.15-0ubuntu0.18.04.2amd64bzip2 module for PHPiiphp7.2-cli 7.2.15-0ubuntu0.18.04.2amd64command-line interpreter for the PHP scripting languageiiphp7.2-common7.2.15-0ubuntu0.18.04.2amd64documentation, examples and common module for PHPiiphp7.2-curl7.2.15-0ubuntu0.18.04.2amd64CURL module for PHPiiphp7.2-fpm 7.2.15-0ubuntu0.18.04.2amd64server-side, HTML-embedded scripting language (FPM-CGI binary)iiphp7.2-gd7.2.15-0ubuntu0.18.04.2amd64GD module for PHPiiphp7.2-json7.2.15-0ubuntu0.18.04.2amd64JSON module for PHPiiphp7.2-mbstring7.2.15-0ubuntu0.18.04.2amd64MBSTRING module for PHPiiphp7.2-opcache 7.2.15-0ubuntu0.18.04.2amd64Zend OpCache module for PHPiiphp7.2-pgsql 7.2.15-0ubuntu0.18.04.2amd64PostgreSQL module for PHPiiphp7.2-readline7.2.15-0ubuntu0.18.04.2amd64readline module for PHPiiphp7.2-xml 7.2.15-0ubuntu0.18.04.2amd64DOM, SimpleXML, WDDX, XML, and XSL module for PHPiiphp7.2-xsl 7.2.15-0ubuntu0.18.04.2allXSL module for PHP (dummy)iiphp7.2-zip 7.2.15-0ubuntu0.18.04.2amd64Zip module for PHP