What is Composer?

Composer is a project dependency manager for PHP programming. That means that it allows us to manage, i.e. specify, download, and keep up to date, the software packages or dependencies on which our PHP project is based.

The reason for using it is that when you develop a PHP application it requires functionality that is not in the default PHP libraries. That is, you have to add others for your project to work or to be able to be carried out.

So, when you start the project you have to go to the page of each of the software components that you want to use, download them, copy them to the folder of your project. This is a bit torturous because at some point these libraries will be updated and then you have to start this process all over again.

Composer was born to avoid this. Because just by defining the right dependencies, Composer will download them and add them to your project in a matter of seconds. And if they are updated, it only takes a minimal effort or command to update them. All without wasting time and in an orderly fashion.

So, let’s get started.

Install PHP Composer on Debian 11

As we can guess, one of the main requirements is to have PHP installed on the system. This shouldn’t be a problem because PHP is present in the Debian 11 repositories and is quite lightweight.

So, open a terminal and as usual update the distribution.

sudo apt update
sudo apt upgrade

Then, you can install PHP in case you don’t have it.

sudo apt install php

Note: If you don’t have sudo available then you have to run these commands as root. Also, you can enable it by reading our post about it.

Now to install Composer on the system, you have to run this single command

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

This command downloads and “compiles” the Composer installer for us.

Then install it in a directory that is in our PATH so that we can use it throughout the system. Also, you have to give it run permissions.

sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer
sudo chmod +x /usr/local/bin/composer

Then, verify the installed version by running

composer --version
composer version 2.1.8 2021-09-15 13:55:14

Using PHP Composer on Debian 11

Before using Composer it is always advisable to upgrade to the latest version. This process can be done by running

composer self-update

If you already have the latest stable version, you will get an output screen like this

You are already using the latest available Composer version 2.1.8 (stable channel)

Composer works with a file called composer.json which is where the project dependencies are stored. To add one you can visit packagist to find one you need.

For example, I will add sebastian/comparator with the command

composer require sebastian/comparator

Just like that, Composer recognizes the dependency, downloads it along with its dependencies, and installs them for our project that we just need to use. And so on with each of the dependencies you need.

To update the versions of the dependencies of your project run

composer update

Or you can update a single one

composer update sebastian/comparator

Also, you can update several at once.

To remove a dependency, just run

composer remove sebastian/comparator

So you can use Composer on Debian 11 in a basic but useful way.

Conclusion

In this post, we have covered the installation of PHP Composer on Debian 11 and a small introduction to its particular usage. This tool has become indispensable for many developers so it is not surprising that it is popular.

The post Install PHP Composer on Debian 11 appeared first on Linux Windows and android Tutorials.

Composer is a php application package manager created to provide a standard format for managing dependencies of PHP Software and required libraries. It is very helpful when you want to manage and integrate external packages into your PHP projects.

Install Composer on CentOS 8

After basic intro, we are going to start the actual installation of Composer on CentOS Operating System. Just follow the below steps to make installation easy.

Step 1: Installing PHP

Run the below command to install php in your local system if it is already not installed.

sudo dnf install @php

Confirm installation by typing command

sabi@localhost ~]$ php -version
PHP 7.2.11 (cli) (built: Oct  9 2018 15:09:36) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies

If you don’t know how to install PHP follow the below link

How To Install php on CentOS 8

Step 2: Downloading Composer Installer

You can easily download the php composer installer package by running

sudo dnf -y install wget
wget https://getcomposer.org/installer -O composer-installer.php

Step 3: Installing PHP Composer on CentOS 8

After downloading the installer, install the composer on your Linux machine by running below command

sudo php composer-installer.php --filename=composer --install-dir=/usr/local/bin 

You’ll see the output similar to the below:

All settings correct for using Composer
Downloading…
Composer (version 1.9.1) successfully installed to: /usr/local/bin/composer
Use it: php /usr/local/bin/composer

You can verify your installation by checking version of composer

composer --version

Run the composer command to check the usage page

$ composer
 Composer version 1.9.1 2019-12-21 17:19:34
 Usage:
   command [options] [arguments]
 Options:
   -h, --help                     Display this help message
   -q, --quiet                    Do not output any message
   -V, --version                  Display this application version
       --ansi                     Force ANSI output
       --no-ansi                  Disable ANSI output
   -n, --no-interaction           Do not ask any interactive question
       --profile                  Display timing and memory usage information
       --no-plugins               Whether to disable plugins.
   -d, --working-dir=WORKING-DIR  If specified, use the given directory as working directory.
       --no-cache                 Prevent use of the cache
   -v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
 Available commands:
   about                Shows the short information about Composer.
   archive              Creates an archive of this composer package.
   browse               Opens the package's repository URL or homepage in your browser.
   check-platform-reqs  Check that platform requirements are satisfied.
   clear-cache          Clears composer's internal package cache.
   clearcache           Clears composer's internal package cache.
   config               Sets config options.
   create-project       Creates new project from a package into given directory.
   depends              Shows which packages cause the given package to be installed.
   diagnose             Diagnoses the system to identify common errors.
   dump-autoload        Dumps the autoloader.
   dumpautoload         Dumps the autoloader.
   exec                 Executes a vendored binary/script.
   global               Allows running commands in the global composer dir ($COMPOSER_HOME).
   help                 Displays help for a command
   home                 Opens the package's repository URL or homepage in your browser.
   i                    Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json.
   info                 Shows information about packages.
   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.
   licenses             Shows information about licenses of dependencies.
   list                 Lists commands
   outdated             Shows a list of installed packages that have updates available, including their latest version.
   prohibits            Shows which packages prevent the given package from being installed.
   remove               Removes a package from the require or require-dev.
   require              Adds required packages to your composer.json and installs them.
   run                  Runs the scripts defined in composer.json.
   run-script           Runs the scripts defined in composer.json.
   search               Searches for packages.
   self-update          Updates composer.phar to the latest version.
   selfupdate           Updates composer.phar to the latest version.
   show                 Shows information about packages.
   status               Shows a list of locally modified packages, for packages installed from source.
   suggests             Shows package suggestions.
   u                    Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
   update               Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
   upgrade              Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
   validate             Validates a composer.json and composer.lock.
   why                  Shows which packages cause the given package to be installed.
   why-not              Shows which packages prevent the given package from being installed.

You have finished Installing Composer on CentOS 8

The post How To Install PHP Composer on CentOS 8 appeared first on Linux Windows and android Tutorials.

Prerequisite

It is essential to have a web server installed. In this case, we will work with Apache. You must also have PHP installed. In the links I just provided you explain in detail how to install each one.

Downloading Composer

To download Composer just go to its official website, and download the latest version. To download Composer just go to its official website, and download the latest version of Composer Setup.

This file installs the application and then adds the corresponding environment variable. Once downloaded, just run it. Forthwith, the wizard will present two types of normal installation or developer mode. The installation is the most common and includes an uninstaller. The developer version provides absolute control over the wizard and does not include an uninstaller. For purposes of this post, use the normal version:

The wizard then indicates the path of the php installed in the system.

The wizard then verifies the operation of the php command line.

The composer installation wizard is very intuitive. As a matter of fact, for php to work properly, a php.ini file is required. So, if this file is not present, the installation will show an error. But don’t worry, the wizard will detect the failure and offer to create the file php.ini.

Then edit the network configuration. Specifically, the information about a proxy server. If you don’t use it, then don’t tick the box and continue the installation.

Once the previous settings have been made, the wizard will start the installation of Composer in the system.

After installing Composer, the wizard warns that it is necessary to open a new window to run the program.

Finally, the assistant has finished his work and Composer was successfully installed in the system.

Testing Composer

As mentioned above, the Composer installer adds the variable environment automatically. So to test the installation of the program, please open a Command Prompt and execute the following command:

composer --version

As can be seen, we have seen how to install Composer on Windows 10. This tool facilitates the development process using the php language. I hope you enjoyed this tutorial. Please share on your social networks.

The post How to install Composer on Windows 10 appeared first on Linux Windows and android Tutorials.

What is Composer?

Composer is a tool for dependency management in PHP. So, it allows you to declare the libraries your project depends on and it will manage (install/update) them for you. This way we will not have to worry about installing those libraries.

To do this, Composer is strongly inspired by NPM and Ruby’s bundler. In other words, it is not a package manager like APT or Yum, because it does not install specific applications globally but only libraries.

On the same Composer website, we are given the following example to show the usefulness of the tool.

First, suppose:

• You have a project that depends on a number of libraries.
• Some of those libraries depend on other libraries.

Composer:

• Enables you to declare the libraries you depend on.
• Finds out which versions of which packages can and need to be installed, and installs them (meaning it downloads them into your project).

So, let us start to install Composer.

Install Composer on Linux

The installation of Composer is quite simple. Because of the impressive tool, it is almost a gift. First, you need to install PHP.

:~$ sudo apt install php libapache2-mod-php php-mbstring php-xmlrpc php-soap php-gd php-xml php-cli php-zip

Next, show the PHP version.

:~$ php -v
PHP 7.0.33-0+deb9u3 (cli) (built: Mar  8 2019 10:01:24) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.33-0+deb9u3, Copyright (c) 1999-2017, by Zend Technologies

Composer requires at least PHP 5.4. However, many Linux distributions in their repositories have recent versions. For example, Ubuntu has version 7.2 and Debian 7.0. In both cases, they are sufficient versions for installation.

Next, you need to install a tool to download the installer using the terminal. Of course, you can do it from the Composer website, but in the terminal, it’s faster.

:~$ sudo apt install curl

Then, install Composer using this command:

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

If you want to install Composer globally, to make it a system command, perform these commands:

:~$ sudo mv composer.phar /usr/local/bin/composer
:~$ sudo chmod +x /usr/local/bin/composer
:~$ source ~/.bashrc

And show the Composer version.

:~$ composer -v

And that’s it.

Conclusion

For web developers, it is important to have tools that help create applications. In this sense, Composer is presented to us as a vital dependency manager for our projects.

So, please share this post with your friends.

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