Composer is a must-have tool for every PHP developer these days. This page is a simple breakdown of quick-install instructions.
How do I install composer?
. Use PHP to download the composer installer, place it in the current directory, and name it
composer-setup.php . Use PHP to check the hash of the file you downloaded and compare it to the known value of the hash. You can always find the current value of the hash for the installer on the
Composer Public Keys / Signatures page.
. Run the setup program to install composer. This does more than just download the latest copy of composer, it also sets up your local ~/.composer directory. This will install composer into the current directory. You can add the --install-dir=DIR to specify where you want composer installed. You can also specify --filename=composer to change the installed filename. You can use anything you like that doesn’t already exist in your specified directory, you don’t have to use the name composer. This is a great way to get rid of the .phar at the end of the name if you don’t like it.
. Use PHP to remove the installer from the current directory.
To install composer for PHP you use PHP to download the installer, set a few options, and then actually perform the install. php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === '55d6ead61b29c7bdee5cccfb50076874187bd9f21f65d8991d46ec5cc90518f447387fb9f76ebae1fbbacf329e583e30') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
Below is a version you can copy ‘n paste.
Breakdown:
Recommended Setup for Linux and macOS:
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === '55d6ead61b29c7bdee5cccfb50076874187bd9f21f65d8991d46ec5cc90518f447387fb9f76ebae1fbbacf329e583e30') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php --install-dir=/usr/local/bin --filename=composer
php -r "unlink('composer-setup.php');"
WARNING: Line two IS WHERE IT compares the hasH of the installer you just downloaded to a hard-coded value. The value specified in the script is the value for the current version of the installer as of this writing. If it fails, check the
Composer Public Keys / Signatures page and get the latest version. Plug it into the script below and try again.
Windows user, change the
--installdir= to a directory in your path.
Recommended Setup for Windows
If you are running Microsoft Windows, the instructions above will work for you as long as you use the proper install paths. You can however download ComposerSetup.exe from the
Composer Introduction page. Execute this and it will install composer and set your path so that you can run composer from anywhere. You will have to close your terminal window and open a new one after the install for the path to be updated.
That’s it, you should now have Composer installed.
Composer installation Resources
*
Composer Homepage *
Composer Introduction *
Download Composer *
Composer Public Keys / Signatures 
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