Composer QuickStart for Mac 10.12 Sierra
This is Short Tutorial Shows You Step-by-step How-to Install the PHP Composer on Mac OS X 10.12 Sierra BSD/Unix.
Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
Composer Manages Packages or Libraries on a per-project basis, Installing them in a directory Inside your Project.

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Open a Terminal Shell Emulator
Applications > Utilities > Terminal
(Press “Enter” to Execute Commands) -
Downloading PHP Composer
Here is described a System wide Installation, for a Local one adapt the commands accordingly.sudo php -r "copy('http://getcomposer.org/installer', 'composer-setup.php');"
If Got “User is Not in Sudoers file” then Look: Solution
Verify the Download:sudo php -r "if (hash_file('SHA384', 'composer-setup.php') === 'e115a8dc7871f15d853148a7fbac7da27d6c0030b848d9b3dc09e2a0388afed865e6a3d6b3c0fad45c48e2b5fc1196ae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
Then Install Composer:
sudo php composer-setup.php
Clean up:
sudo php -r "unlink('composer-setup.php');"
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Relocating Composer
sudo mv composer.phar /usr/local/bin/composer
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Testing Composer Installation
composer -V
The Command will Shows up the Composer Version…