Downloading
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Then Download 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
And 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;"
Next Install Composer:
sudo php composer-setup.php
Finally Clean up:
sudo php -r "unlink('composer-setup.php');"