查看php安装模块的方法：首先进入命令窗口；然后输入命令“php -m”并执行；最后查看php已安装的模块即可。
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Ubuntu 查看php已安装扩展及相关软件包
查看php已安装扩展
$ php -m [PHP Modules] bcmath bz2 calendar Core ctype curl date dom exif fileinfo filter ftp gd gettext hash iconv igbinary json libxml mbstring memcached msgpack openssl pcntl pcre PDO pdo_pgsql pgsql Phar posix readline redis Reflection session shmop SimpleXML sockets sodium SPL standard sysvmsg sysvsem sysvshm tokenizer wddx xml xmlreader xmlwriter xsl Zend OPcache zip zlib [Zend Modules] Zend OPcache
查看安装php相关软件包：
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$dpkg -l | grep 'php' ii libapache2-mod-php7.2 7.2.15-0ubuntu0.18.04.2 amd64 server-side, HTML-embedded scripting language (Apache 2 module) ii php 1:7.2+60ubuntu1 all server-side, HTML-embedded scripting language (default) ii php-auth-sasl 1.0.6-3 all Abstraction of various SASL mechanism responses ii php-cli-prompt 1.0.3+dfsg-1 all tiny helper prompting for user input ii php-common 1:60ubuntu1 all Common files for PHP packages ii php-composer-ca-bundle 1.1.0-1 all utility library to find a path to the system CA bundle ii php-composer-semver 1.4.2-1 all utilities, version constraint parsing and validation ii php-composer-spdx-licenses 1.3.0-1 all SPDX licenses list and validation library ii php-igbinary 2.0.5-1build1 amd64 igbinary PHP serializer ii php-json-schema 5.2.6-1 all implementation of JSON schema ii php-mail 1.3.0-1 all Class that provides multiple interfaces for sending emails ii php-memcached 3.0.1+2.2.0-1build2 amd64 memcached extension module for PHP, uses libmemcached ii php-msgpack 2.0.2+0.5.7-2build1 amd64 PHP extension for interfacing with MessagePack ii php-net-smtp 1.8.0-1 all PHP PEAR module implementing SMTP protocol ii php-net-socket 1.0.14-2 all Network Socket Interface ii php-pear 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1 all PEAR Base System ii php-psr-log 1.0.2-1 all common interface for logging libraries ii php-redis 3.1.6-1build1 amd64 PHP extension for interfacing with Redis ii php-symfony-console 3.4.6+dfsg-1ubuntu0.1 all run tasks from the command line ii php-symfony-debug 3.4.6+dfsg-1ubuntu0.1 all tools to make debugging of PHP code easier ii php-symfony-filesystem 3.4.6+dfsg-1ubuntu0.1 all basic filesystem utilities ii php-symfony-finder 3.4.6+dfsg-1ubuntu0.1 all find files and directories ii php-symfony-polyfill-mbstring 1.6.0-2 all Symfony polyfill for the Mbstring extension ii php-symfony-process 3.4.6+dfsg-1ubuntu0.1 all execute commands in sub-processes ii php7.2 7.2.15-0ubuntu0.18.04.2 all server-side, HTML-embedded scripting language (metapackage) ii php7.2-bcmath 7.2.15-0ubuntu0.18.04.2 amd64 Bcmath module for PHP ii php7.2-bz2 7.2.15-0ubuntu0.18.04.2 amd64 bzip2 module for PHP ii php7.2-cli 7.2.15-0ubuntu0.18.04.2 amd64 command-line interpreter for the PHP scripting language ii php7.2-common 7.2.15-0ubuntu0.18.04.2 amd64 documentation, examples and common module for PHP ii php7.2-curl 7.2.15-0ubuntu0.18.04.2 amd64 CURL module for PHP ii php7.2-fpm 7.2.15-0ubuntu0.18.04.2 amd64 server-side, HTML-embedded scripting language (FPM-CGI binary) ii php7.2-gd 7.2.15-0ubuntu0.18.04.2 amd64 GD module for PHP ii php7.2-json 7.2.15-0ubuntu0.18.04.2 amd64 JSON module for PHP ii php7.2-mbstring 7.2.15-0ubuntu0.18.04.2 amd64 MBSTRING module for PHP ii php7.2-opcache 7.2.15-0ubuntu0.18.04.2 amd64 Zend OpCache module for PHP ii php7.2-pgsql 7.2.15-0ubuntu0.18.04.2 amd64 PostgreSQL module for PHP ii php7.2-readline 7.2.15-0ubuntu0.18.04.2 amd64 readline module for PHP ii php7.2-xml 7.2.15-0ubuntu0.18.04.2 amd64 DOM, SimpleXML, WDDX, XML, and XSL module for PHP ii php7.2-xsl 7.2.15-0ubuntu0.18.04.2 all XSL module for PHP (dummy) ii php7.2-zip 7.2.15-0ubuntu0.18.04.2 amd64 Zip module for PHP
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