"Your command line PHP installation is too old" When trying to run Drush on my shared hosting account I get this error:


  Your command line PHP installation is too old. Drush requires at least PHP 5.3.0.
  To suppress this check, set the environment variable DRUSH_NO_MIN_PHP=1


When I type php --version, it tells me that I am running PHP 5.2.6. 

The .bashrc file has the following lines

export COLUMNS
alias drush='/usr/bin/php ~/public_html/drush/drush.php'
alias php='/usr/bin/php'


How I can fix this?
I had a similar problem and I was able to specify what version of PHP Drush will use by adding the following to my .bash_profile file:

export DRUSH_PHP=/usr/local/php53/bin/php


That got mine working.  I had tried a more general approach where I specified PHP 5.3 for my command line generally, but this didn't work.  Specifically targeting Drush is what it took for me.