Composer is a tool used in PHP to manage dependency relationships. You can declare the external libraries (libraries) you depend on in your project, and Composer will install these dependent library files for you.
PHP Composer installation
System requirements:
Composer requires PHP5.3.2 or above to run. There are several sensitive PHP settings and compilation flags that are also required, but the installer will issue a warning when any incompatibilities exist.
For example, the requirement for PHP extensions is to install or recompile php without –disable-phar
In order to install the package from the source address, rather than a simple compressed file package, you will need to install Version control tools for software packages, such as git, svn or hg, etc.
Composer is multi-platform compatible and runs on Windows, Linux and OSX.
Installation failed error message:
curl -sS https://getcomposer.org/installer | PHP #!/usr/bin/env php some settings on your machine make Composer unable to work properly. Make sure that you fix the issues listed below and run this script again: The phar extension is missing. Install it or recompile php without –disable-phar Your PHP (5.2.9) is too old, you must upgrade to PHP 5.3.2 or higher.
My local default development environment is PHP 5.2.9, and when I try to install it in PHP 5.2. When installing on 9, it prompts that the version is too low and needs to be upgraded to PHP 5.3.2 or higher.
So I downloaded XAMPP 1.7.7 usb lite version.
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php\php.exe -v PHP 5.3.8 (cli) (built: Aug 23 2011 11:50:20) Copyright (c) 1997-2011 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
The PHP environment under XAMPP 1.7.7 is 5.3.8. After confirming that my PHP environment is greater than or equal to PHP5.3.2.
PHP 5.3 Installing Composer
E:\USB\Dropbox\phpstorm\php53>curl -sS https://getcomposer.org/installer | E:\USB\xampp_177\php\php.exe #!/usr/bin/env php Some settings on your machine may cause stability issues with Composer. If you encounter issues, try to change the following: The openssl extension is missing, which will reduce the security and stability o f Composer. If possible you should enable it or recompile php with –with-openssl Downloading… Composer successfully installed to: E:\USB\Dropbox\phpstorm\php53\composer.phar Use it: php composer.phar
Note:
I turned off XAMPP 1.7.7 Apache's SSL module, so Composer prompted me with a warning and suggested that I enable the SSL module for security reasons. It does not affect use if it is not turned on.
Parameters during installation | PHP, must be changed to the real PHP environment path, such as | E:\USB\xampp_177\php\php.exe
Use Composer as the PHP path command, in the environment we installed , the usage method is: E:\USB\xampp_177\php/php.exe composer.phar command.
The environment I installed is under Windows. If it is under Linux and the PHP 5.3 environment is not under the default PHP command, you should use | /usr/php/53/usr/bin/php, for example:
curl -sS https://getcomposer.org/installer | /usr/php/53/usr/bin/php
After the installation is complete, check the installation version.
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php/php.exe composer.phar -V Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33
Check the PHP Composer command:
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php/php.exe composer.phar
______
/ ____/___ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
/_/
Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33
Usage:
[options] command [arguments]
Options:
–help -h Display this help message.
–quiet -q Do not output any message.
–verbose -v Increase verbosity of messages.
–version -V Display this application version.
–ansi Force ANSI output.
–no-ansi Disable ANSI output.
–no-interaction -n Do not ask any interactive question.
–profile Display timing and memory usage information
–working-dir -d If specified, use the given directory as working directory
.
Available commands:
about Short information about Composer
archive Create an archive of this composer package
config Set config options
create-project Create new project from a package into given directory.
depends Shows which packages depend on the given package
diagnose Diagnoses the system to identify common errors.
dump-autoload Dumps the autoloader
dumpautoload Dumps the autoloader
help Displays help for a command
init Creates a basic composer.json file in current directory.
install Installs the project dependencies from the composer.lock file
if present, or falls back on the composer.json.
list Lists commands
require Adds required packages to your composer.json and installs the
m
run-script Run the scripts defined in composer.json.
search Search for packages
self-update Updates composer.phar to the latest version.
selfupdate Updates composer.phar to the latest version.
show Show information about packages
status Show a list of locally modified packages
update Updates your dependencies to the latest version according to
composer.json, and updates the composer.lock file.
validate Validates a composer.jsonThis way we are in the PHP5.3 environment The Composer under has been installed.
Similarly, we can also install PHP 5.4 environment.
PHP 5.4 Install Composer
Download the XAMPP 1.8.1 usb lite version and you will get the PHP5.4.7 environment.
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_181\php\php.exe -v PHP 5.4.7 (cli) (built: Sep 12 2012 23:48:31) Copyright (c) 1997-2012 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
After confirming that the version is higher than PHP 5.3.2, start the installation:
E:\USB\Dropbox\phpstorm\php54>curl -sS https://getcomposer.org/installer | E:\USB\xampp_181\php\php.exe #!/usr/bin/env php Some settings on your machine may cause stability issues with Composer. If you encounter issues, try to change the following: The openssl extension is missing, which will reduce the security and stability o f Composer. If possible you should enable it or recompile php with –with-openssl Downloading… Composer successfully installed to: E:\USB\Dropbox\phpstorm\php54\composer.phar Use it: php composer.phar
After the installation is complete, check the installed version.
E:\USB\Dropbox\phpstorm\php54>E:\USB\xampp_181\php/php.exe composer.phar -V Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33
In this way, Composer in the PHP 5.4 environment is also installed successfully.
PHP Composer usage
Here I only briefly demonstrate using PHP Composer to install the Symfony framework.
First of all, briefly explain the standard format of the command:
php composer.phar create-project symfony/framework-standard-edition path/ 2.2.1
The first parameter PHP is the local PHP development environment, pointing to the PHP running command.
The second parameter is downloaded in composer.phar mode.
The third parameter is an action command, such as create-project. The purpose is to create a new project from a software package to the specified directory.
The fourth parameter is the directory of local installation.
The fifth parameter is the version of the installed software package.
According to the above we installed Composer in PHP5.4 environment, our installation command is:
E:\USB\Dropbox\phpstorm\php54>E:\USB\xampp_181\php/php.exe composer.phar create-project symfony/framework-standard-edition E:\USB\xampp_181\htdocs\Symfony 2.2.1
Installation result:
Installing symfony/framework-standard-edition (v2.2.1) – Installing symfony/framework-standard-edition (v2.2.1) Downloading: 100% Created project in E:\USB\xampp_181\htdocs\Symfony Loading composer repositories with package information Installing dependencies from lock file – Installing doctrine/lexer (v1.0) Downloading: 100% – Installing doctrine/annotations (v1.1) Downloading: 100% – Installing doctrine/cache (v1.0) Downloading: 100% – Installing doctrine/collections (v1.1) Downloading: 100% – Installing twig/twig (v1.12.2) Downloading: 100% – Installing psr/log (1.0.0) Downloading: 100% – Installing doctrine/inflector (v1.0) Downloading: 100% – Installing doctrine/common (2.4.0-RC1) Downloading: 100% – Installing symfony/symfony (v2.2.1) Downloading: 100% – Installing jdorn/sql-formatter (v1.2.0) Downloading: 100% – Installing doctrine/dbal (2.3.3) Downloading: 100% – Installing doctrine/doctrine-bundle (v1.2.0-beta1) Downloading: 100% – Installing doctrine/orm (2.3.3) Downloading: 100% – Installing jms/cg (1.0.0) Downloading: 100% – Installing phpoption/phpoption (1.2.0) Downloading: 100% – Installing jms/parser-lib (1.0.0) Downloading: 100% – Installing jms/metadata (1.3.0) Downloading: 100% – Installing jms/aop-bundle (1.0.0) Downloading: 100% – Installing jms/di-extra-bundle (1.3.0) Downloading: 100% – Installing jms/security-extra-bundle (1.4.0) Downloading: 100% – Installing sensio/distribution-bundle (v2.2.1) Downloading: 100% – Installing sensio/framework-extra-bundle (v2.2.1) Downloading: 100% – Installing sensio/generator-bundle (v2.2.1) Downloading: 100% – Installing kriswallsmith/assetic (v1.1.0-alpha4) Downloading: 100% – Installing symfony/assetic-bundle (v2.1.2) Downloading: 100% – Installing monolog/monolog (1.4.1) Downloading: 100% – Installing symfony/monolog-bundle (v2.2.0) Downloading: 100% – Installing swiftmailer/swiftmailer (v4.3.0) Downloading: 100% – Installing symfony/swiftmailer-bundle (v2.2.0) Downloading: 100% – Installing twig/extensions (v1.0.0) Downloading: 100% kriswallsmith/assetic suggests installing leafo/lessphp (Assetic provides the integration with the lessphp LESS compiler) kriswallsmith/assetic suggests installing leafo/scssphp (Assetic provides the integration with the scssphp SCSS compiler) kriswallsmith/assetic suggests installing leafo/scssphp-compass (Assetic provides the integration with the SCSS compass plugin) kriswallsmith/assetic suggests installing ptachoire/cssembed (Assetic provides the integration with phpcssembed to embed data uris) monolog/monolog suggests installing doctrine/couchdb (Allow sending log messages to a CouchDB server) monolog/monolog suggests installing ext-amqp (Allow sending log messages to an AMQP server (1.0+ required)) monolog/monolog suggests installing ext-mongo (Allow sending log messages to a MongoDB server) monolog/monolog suggests installing mlehner/gelf-php (Allow sending log messages to a GrayLog2 server) monolog/monolog suggests installing raven/raven (Allow sending log messages to a Sentry server) Generating autoload files Clearing the cache for the dev environment with debug true Installing assets using the hard copy option Installing assets for Symfony\Bundle\FrameworkBundle into web/bundles/framework Installing assets for Acme\DemoBundle into web/bundles/acmedemo Installing assets for Sensio\Bundle\DistributionBundle into web/bundles/sensiodistribution
From the command line results, we see the installation process and results of the entire Symfony framework.
PHP Composer defines dependencies
Composer will automatically look for the composer.json file when used. composer.json will be used to define the dependency packages of the entire project. For example:
{
"require": {
"monolog/monolog": "1.2.*"
}
}Dependency package A brief explanation, our project requires some monolog/monolog packages of any version starting from 1.2.
Composer is a dependency management tool in PHP. Through Composer we can save a lot of files and control the versions of dependent packages when publishing software.
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