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Defining and Installing Composer Dependencies in PHP
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Defining and Installing Composer Dependencies in PHP

InfinityCoder December 27, 2016

You want to use Composer. This allows you to install new packages, upgrade, and get information about your existing packages.

Install Composer:

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% curl -sS https://getcomposer.org/installer | php

To execute a command, type the command name as the first argument on the command line:

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% php composer.phar command

To install Composer, you download the installer file and send it to PHP. Composer uses PHP to ensure your system is set up as it requires, handle any configuration settings, and complete the installation process.

When it’s done, you have a file called composer. phar in the current directory.

Composer is a PHP script, so you can ask PHP to run it:

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% php composer.phar command

Or, run it directly by putting composer.phar in the same location as PHP:

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% mv composer.phar /usr/local/bin/composer
 
% composer command

If you have problems, make sure you have permission to write to that directory and that the file is executable:

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% sudo mv composer.phar /usr/local/bin/composer
 
% sudo chmod +x /usr/local/bin/composer

Your copy of PHP may be in a different place. To find it, run:

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% which php
 
/usr/bin/php

With Composer up and running, pass it commands to execute. For example, to install a package:

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% composer install

For a list of all valid Composer commands, use list.

Composer has commands for both using and developing packages; as a result, there are some commands that you may not need.

The archive command, for example, creates a new package. If you only run other people’s packages, you can safely ignore this command.
See Table 27-1 for a list of frequently used commands.
Table 27-1. Common Composer commands

Command name Description
search

init

install

update

self-update

Searches for packages

Creates a basic composer.json file

Installs the project dependencies

Updates your dependencies to the latest version

Updates Composer to the latest version

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