Useful PHP Dependency management Tools composer Novice Tutorials

PHP Dependency management Tools composer Novice Tutorials

Composer is a dependency management tool for PHP. It agrees with the code base that you declare the project depends on, and it installs them for you in your project.

Dependency Management

Composer is not a package manager.

Yes, it involves "packages" and "libraries", but it is managed on a per-project basis and is installed in one of your project's folders (such as vendor).

By default it will not be installed globally, regardless of the thing. Therefore, this is only a dependency management.

The idea is not new, and Composer is strongly inspired by node's NPM and Ruby's bundler. There was no such tool under PHP at the time.

Composer will solve this problem for you:
You have a project that relies on a number of libraries.
Some of these libraries depend on other libraries.
You declare what you depend on.
Composer will find out which version number of the package needs to be installed. and install them (download them to your project).

References: http://www.lai18.com/content/319715.html
Http://docs.phpcomposer.com/00-intro.md
declaring dependencies

For example, you are creating a project and you need a library to do the logging. You decide to use Monolog. To add it to your project, all you need to do is create a Composer.json file. It describes the dependencies of the project.

{"    require": {        "Monolog/monolog": "1.2.*"    }}

We just need to point out that our project needs some monolog/monolog packages, starting from 1.2 regardless of the version number.

System Requirements

PHP 5.3.2+ above version number is required to execute Composer. Some sensitive PHP settings and compilation flags are also required, but a warning will be thrown for any incompatible installation program.

Instead of simply downloading the zip file, we will install it directly from the source of the package, and you need git, svn, or HG, depending on the version number management system you are using to load the package.

Composer is multi-platform, and we strive to make it as good as it does on Windows, Linux and OSX platforms.

Linux/unix under Installation

Partial installation

To really get Composer. We need to do two things.

First install Composer (the same, which means it will be downloaded to your project):

Curl-ss Https://getcomposer.org/installer | Php

Note: If the above method fails for some reason, you can also download the installer via PHP >:

Php-r "ReadFile (' Https://getcomposer.org/installer ');" | Php

This will check for some PHP settings. Then download Composer.phar to your working folder.

This is a binary file of Composer.

This is a PHAR package (PHP archive), which is a PHP archive format that helps users run some operations on the command line.

You can specify the installation folder for Composer by using the--install-dir option (it can be an absolute or relative path):

Curl-ss Https://getcomposer.org/installer | PHP----install-dir=bin

Global Installation

You can place this file wherever you are. Suppose you put it in the PATH folder of the system. You'll be able to access it in the global interview.

In Unix-like systems, you can even use PHP without a prefix.

You can run these commands to let composer make a global call on your system:

Curl-ss Https://getcomposer.org/installer | PHPMV Composer.phar/usr/local/bin/composer

Note: Assume that the appeal command failed due to permission execution. Please use sudo again to try to execute the MV Line command.

Now it is only necessary to execute the composer command to be able to use composer without the need to enter PHP Composer.phar.

Global installation (on OSX via homebrew)

Composer is part of the homebrew-php project.

Brew Updatebrew Tap josegonzalez/homebrew-phpbrew tap homebrew/versionsbrew install php55-intlbrew install Josegonzalez /php/composer

Install under Windows

Using the Setup program

This is the simplest way to install Composer on your machine.

Download and execute composer-setup.exe. It will install the latest version number of the Composer. and set up the environment variables of the system, so you can use the composer command directly under whatever folder.

Manual Installation

Set the system's environment variable PATH and execute the install command to download the Composer.phar file:

C:\USERS\USERNAME>CD c:\binc:\bin>php-r "ReadFile (' Https://getcomposer.org/installer ');" | Php

Note: Assume that you receive the ReadFile error prompt. Please use the HTTP link or open Php_openssl.dll in php.ini. Create a new file Composer.bat under the Composer.phar Sibling folder:

C:\bin>echo @php "%~dp0composer.phar"%*>composer.bat

Close the current command line form. Open a new command line form to test:

C:\users\username>composer-vcomposer version 27d8904

using Composer

Today we will use Composer to install the dependencies of the project.

To resolve and download dependencies. Please run the install command:

PHP Composer.phar Install

Suppose you have a global installation. And there is no Phar file in the current folder. Use the following command instead:

Composer Install

Continue with the example above. This will download the Monolog to the Vendor/monolog/monolog folder.

Take your own initiative to load

In addition to the library download. Composer also prepared an initiative to load the file himself. It can load all the class files in the library that Composer downloaded.

Use it. You just need to add the following line of code to your project's boot file:

Require ' vendor/autoload.php ';

Now we are able to use the Monolog!

Extended Reading

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Useful PHP Dependency management Tools composer Novice Tutorials