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加载一个包
composer require symfony/finder指定版本号：
composer require knplabs/console-service-provider:2.x开发版包
composer require knplabs/console-service-provider:2.x-dev composer require gregwar/image-bundle:dev-master -
更新自动加载的文件
composer dump-autoload -
设置proxy，并升级composer
HTTP_PROXY=http://ip:port && composer self-update -
清除缓存
composer clearcache -
创建一个新的项目
composer create-project symfony/framework-standard-edition my_project_name "2.8.*"PS：它相当于执行了 git clone 命令后，将这个包的依赖安装到它自己的 vendor 目录。
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搜索包信息
$ composer search guzzle eightpoints/guzzle-bundle Integrates Guzzle into Symfony2, comes with WSSE Plugin for RESTful Interfaces eightpoints/guzzle-wsse-middleware WSSE Middleware for Guzzle, a PHP HTTP client library and framework for building RESTful web service clients guzzlehttp/guzzle Guzzle is a PHP HTTP client library guzzlehttp/promises Guzzle promises library guzzlehttp/psr7 PSR-7 message implementation that also provides common utility methods guzzlehttp/guzzle Guzzle is a PHP HTTP client library guzzlehttp/psr7 PSR-7 message implementation that also provides common utility methods guzzlehttp/promises Guzzle promises library php-http/guzzle6-adapter Guzzle 6 HTTP Adapter guzzle/guzzle PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle guzzlehttp/streams Provides a simple abstraction over streams of data guzzlehttp/ringphp Provides a simple API and specification that abstracts away the details of HTTP into a single PHP function. kevinrob/guzzle-cache-middleware A HTTP/1.1 Cache for Guzzle 6. It's a simple Middleware to be added in the HandlerStack. (RFC 7234) eightpoints/guzzle-bundle Integrates Guzzle 6.x, a PHP HTTP Client, into Symfony 2/3/4. Comes with easy and powerful configuration options and optional plugins. guzzlehttp/guzzle-services Provides an implementation of the Guzzle Command library that uses Guzzle service descriptions to describe web services, serialize requests, and parse responses into easy to use model structures. csa/guzzle-bundle A bundle integrating GuzzleHttp >= 4.0 kitetail/zttp A developer-experience focused HTTP client, optimized for most common use cases. intercom/intercom-php Intercom API client built on top of Guzzle 6 guzzlehttp/oauth-subscriber Guzzle OAuth 1.0 subscriber guzzlehttp/command Provides the foundation for building command-based web service clients -
查看包信息
composer show monolog/monolog name : monolog/monolog descrip. : Sends your logs to files, sockets, inboxes, databases and various web services keywords : log, logging, psr-3 versions : * 1.23.0 type : library license : MIT License (MIT) (OSI approved) https://spdx.org/licenses/MIT.html#licenseText source : [git] https://github.com/Seldaek/monolog.git fd8c787753b3a2ad11bc60c063cff1358a32a3b4 dist : [zip] https://api.github.com/repos/Seldaek/monolog/zipball/fd8c787753b3a2ad11bc60c063cff1358a32a3b4 fd8c787753b3a2ad11bc60c063cff1358a32a3b4 names : monolog/monolog, psr/log-implementation选项：
- installed (-i): 列出已安装的依赖包。
- platform (-p): 仅列出平台软件包（PHP 与它的扩展）。
- self (-s): 仅列出当前项目的信息。
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手动执行脚本 composer.json中包含的run-script部分：
"scripts" : { "symfony-scripts" : [ "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters", "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap", "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache", "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets", "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile", "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget" ], "post-install-cmd" : "@symfony-scripts", "post-update-cmd" : "@symfony-scripts" },可执行如下命令：
composer run-script post-update-cmd -
关于出现PHP版本异常错误
requires php >=5.6 -> your PHP version (7.1.7) overridden by "config.platform.php" version (5.5.9) does not satisfy that requirement.删除相关配置项即可：
{ "config": { "platform":{ "php":"5.5.9" } } } -
优化自动加载的文件，提升效率
composer dump-autoload --optimize -
查看包信息和版本号信息
composer show -a kitlabs/kit-generator-bundle name : kitlabs/kit-generator-bundle descrip. : extend SensioGeneratorBundle keywords : Generator Bundle, generate crud, generate form versions : dev-master, v0.2.7, v0.2.6, v0.2.5, v0.2.4, v0.2.3, v0.2.2, v0.2.1, v0.2.0, v0.1.3, v0.1.2 type : symfony-bundle license : MIT License (MIT) (OSI approved) https://spdx.org/licenses/MIT.html#licenseText source : [git] https://github.com/kitlabs-cn/KitGeneratorBundle.git 06a2e6f09cc8b71f5aeef1b3ef88fa7fef1fcf78 dist : [zip] https://api.github.com/repos/kitlabs-cn/KitGeneratorBundle/zipball/06a2e6f09cc8b71f5aeef1b3ef88fa7fef1fcf78 06a2e6f09cc8b71f5aeef1b3ef88fa7fef1fcf78 names : kitlabs/kit-generator-bundle autoload psr-4 Kit\GeneratorBundle\ => . requires php >=5.5.9 sensio/generator-bundle >=v3.0 knplabs/knp-paginator-bundle ^2.8