摘要：
Could not open input file: composer.pharIf anyone else came this low on the page and still... 
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Could not open input file: composer.phar
If anyone else came this low on the page and still didn’t find a working answer (like I did), use this:
解决：
$ curl -sS https://getcomposer.org/installer | php
$ mv composer.phar /usr/local/bin/composer.phar
$ alias composer=’/usr/local/bin/composer.phar’
$ composer –version
sudo composer.phar update
sudo composer phar install
et voila! A working composer
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