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Composer provides dependencies management of PHP programming language, developed by Nilsadermann and JoddiBoganiano.

First if you had try to install & not succeed, then first remove composer directory from system, for that past following command in terminal :

sudo rm -r /usr/local/bin/composer

Step 1 : Download composer

Now download composer from its official website.

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

Step 2 : Install composer

If we want to run composer from everywhere inside out system, then we should install it globally. So need to install in following path : /usr/local/bin

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

Step 3 : Test composer

After installation check all run smoothly or not by typing "composer" in terminal or if it nor run then use following command :

php /usr/local/bin/composer

Step 4 : Run globally

To access composer from anywhere, need to move installed file in following path : /usr/local/bin/composer, by following command :

mv composer.phar /usr/local/bin/composer

Now, all done here, try to run from anywhere : "composer".