{"id":1088,"date":"2018-10-21T05:51:24","date_gmt":"2018-10-21T05:51:24","guid":{"rendered":"https:\/\/www.appservgrid.com\/paw92\/?p=1088"},"modified":"2018-10-23T00:49:02","modified_gmt":"2018-10-23T00:49:02","slug":"how-to-install-and-use-composer-on-debian-9","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2018\/10\/21\/how-to-install-and-use-composer-on-debian-9\/","title":{"rendered":"How To Install and Use Composer on Debian 9"},"content":{"rendered":"

Composer<\/a> is a dependency manager for PHP (similar to npm for Node.js<\/a> or pip for Python<\/a>). Composer will pull in all the required PHP packages your project depends on and manage them for you.<\/p>\n

This tutorial provides the steps necessary to install Composer on Debian 9 systems. We will also cover how to use Composer to create and manage PHP projects.<\/p>\n

Prerequisites<\/h2>\n

Before continuing with this tutorial, make sure you are logged in as a user with sudo privileges<\/a> and you have PHP installed on your Debian 9<\/a> system.<\/p>\n

Installing Composer<\/h2>\n

Follow the steps below to install Composer on Debian systems:<\/p>\n

    \n
  1. First update the packages index and install the necessary packages with the following commands:\n

    sudo apt update
    \nsudo apt install php-cli php-zip wget unzip<\/li>\n

  2. Once the dependencies are installed, use the php cli toll to download the Composer installation script:\n

    php -r “copy(‘https:\/\/getcomposer.org\/installer’, ‘composer-setup.php’);”<\/p>\n

    The command above will download the composer-setup.php file in the current working directory.<\/li>\n

  3. We\u2019ll verify the script data integrity by comparing the script SHA-384 hash with the latest installer hash found on the Composer Public Keys \/ Signatures<\/a> page.\n

    Run the following wget command<\/a> to download the expected signature of the latest Composer installer from the Composer\u2019s Github page and store it in a variable named HASH:<\/p>\n

    HASH=”$(wget -q -O – https:\/\/composer.github.io\/installer.sig)”<\/p>\n

    To verify that the installation script is not corrupted copy and paste the following code into your console:<\/p>\n

    php -r “if (hash_file(‘SHA384’, ‘composer-setup.php’) === ‘$HASH’) { echo ‘Installer verified’; } else { echo ‘Installer corrupt’; unlink(‘composer-setup.php’); } echo PHP_EOL;”<\/p>\n

    If the hashes match, you\u2019ll see the following output:<\/p>\n

    If the hashes doesn\u2019t match you will see Installer corrupt. In this case you will need to redownload the Composer installation script and double check the value of the $HASH variable with echo $HASH. Once the installer is verified, you can continue with the next step.<\/li>\n

  4. The following command will install Composer in the \/usr\/local\/bin directory:\n

    sudo php composer-setup.php –install-dir=\/usr\/local\/bin –filename=composerAll settings correct for using Composer
    \nDownloading…<\/p>\n

    Composer (version 1.7.2) successfully installed to: \/usr\/local\/bin\/composer
    \nUse it: php \/usr\/local\/bin\/composer<\/p>\n

    At this point you have Composer installed on your Debian system. It is installed as a system-wide command and it will be available for all users.<\/li>\n

  5. To verify the installation simply type:\n

    The command above will print the Composer\u2019s version, commands and arguments.<\/p>\n

    ______
    \n\/ ____\/___ ____ ___ ____ ____ ________ _____
    \n\/ \/ \/ __ \/ __ `__ \/ __ \/ __ \/ ___\/ _ \/ ___\/
    \n\/ \/___\/ \/_\/ \/ \/ \/ \/ \/ \/ \/_\/ \/ \/_\/ (__ ) __\/ \/
    \n____\/____\/_\/ \/_\/ \/_\/ .___\/____\/____\/___\/_\/
    \n\/_\/
    \nComposer version 1.7.2 2018-08-16 16:57:12<\/p>\n

    Usage:
    \ncommand [options] [arguments]<\/li>\n<\/ol>\n

    If you want to use a per-project Composer installation run the following command php composer-setup.php which will create a file named composer.phar in your current working directory. You can use the composer by running .\/composer.phar <command>.<\/p>\n

    Getting Started with Composer<\/h2>\n

    Now that you have Composer is installed on your Debian system we will show you how to create a PHP project with Composer.<\/p>\n

    Start by creating a a directory which will be the project root and hold the composer.json file. This file describes your PHP project including the PHP dependencies and other metadata.<\/p>\n

    Create the project directory and switch to it with:<\/p>\n

    mkdir ~\/my-first-composer-project
    \ncd ~\/my-first-composer-project<\/p>\n

    Next, we\u2019ll initialize a new composer.json file using the composer require <package name> command and specify the package we want to download. In this example we will create a sample application that will print the current time using a package called carbon<\/a>.<\/p>\n

    Run the following command to initialize a new composer.json file and install the carbon package:<\/p>\n

    composer require nesbot\/carbonUsing version ^1.34 for nesbot\/carbon
    \n.\/composer.json has been created
    \nLoading composer repositories with package information
    \nUpdating dependencies (including require-dev)
    \n– Installing symfony\/polyfill-mbstring (v1.9.0): Downloading (100%)
    \n– Installing symfony\/translation (v3.4.17): Downloading (100%)
    \n– Installing nesbot\/carbon (1.34.0): Downloading (100%)
    \nsymfony\/polyfill-mbstring suggests installing ext-mbstring (For best performance)
    \nsymfony\/translation suggests installing symfony\/config
    \nsymfony\/translation suggests installing symfony\/yaml
    \nsymfony\/translation suggests installing psr\/log-implementation (To use logging capability in translator)
    \nWriting lock file
    \nGenerating autoload files<\/p>\n

    Composer will create a composer.json file and download and install carbon and all its dependencies.<\/p>\n

    If you list your project\u2019s directory, you will see that it contains two files composer.json and composer.lock, and a vendor directory.<\/p>\n

    -rw-r–r– 1 linuxize users 60 Oct 16 21:02 composer.json
    \n-rw-r–r– 1 linuxize users 6851 Oct 16 21:02 composer.lock
    \ndrwxr-xr-x 5 linuxize users 4096 Oct 16 21:02 vendor<\/p>\n