How to fix my problem when trying to create a Drupal sub-theme with Drush?
The issue mostly will be with environment/php and this is issue with MAMP (mismatch of path your MAMP-php and Server-php). Follow this link from that article.


  The Solution: A Symlink
  
  For the sake of ease, let’s just make your terminal sessions use the
  same PHP executable as MAMP. So run this:

$ mv /usr/bin/php /usr/bin/php.bak 
$ ln -s /Applications/MAMP/bin/php/php5.5.3/bin/php /usr/bin/php



But you need to check path as per your folders.