How to install and use composer

1. How to install and use composer
2. References

How to install and use composer

1. Install composer
   • installing composer on hostinger shared hosting

      $ vi composer-installer.sh
     

    #!/bin/sh
    EXPECTED_SIGNATURE=$(wget -q -O - https://composer.github.io/installer.sig)
    php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
    ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', 'composer-setup.php');")
    if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
    then
        >&2 echo 'ERROR: Invalid installer signature'
        rm composer-setup.php
        exit 1
    fi
    php composer-setup.php --quiet
    RESULT=$?
    rm composer-setup.php
   

    $ sh composer-installer.sh
    $ composer
       ______
      / ____/___  ____ ___  ____  ____  ________  _____
     / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
    / /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
    \____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                       /_/
    Composer version x.x.x YYYY-mm-dd HH:MM:SS
   

   • installing composer on Linux/MacOS

    (local installation)
    $ php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
    $ php -r "if (hash_file('SHA384', 'composer-setup.php') === '669656bab3166a7aff8a7506b8cb2d1c292f042046c5a994c43155c0be6190fa0355160742ab2e1c88d40d5be660b410') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
    $ php composer-setup.php --install-dir=bin --filename=composer
    $ php bin/composer
   
    (global installation after local installation)
    $ sudo mv composer.phar /usr/local/bin/composer
    $ composer
   

   • installing composer on Windows
     Download the latest composer version, Install and Run
2. Generating and understanding composer.json
   • Create a new directory and enter

    $ mkdir phptimer
    $ cd phptimer
   

   • find a composer package or library at packagist
     

   • install

    $ composer require phpunit/php-timer
    (composer will create two new files - `composer.json` and `composer.lock`)
   

3. Using autoload script

    require 'vendor/autoload.php'
   

    require 'vendor/autoload.php'
    PHP_Timer::start();
    // your code
    $time = PHP_Timer::stop();
    var_dump($time);
    print PHP_Timer::secondsToTimeString($time)
   

4. Updating your project dependencies

    $ composer update 
    $ composer update vendor/package vendor2/package2
   

References

• How to Install and Use Composer