Often we encounter problems when hosting Drupal site on shared servers like webfaction. The PHP version that we used while development of the site is not there on the hosting server. If you are using webfaction then the steps below can be used to switch your site's PHP version.
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I have been developing the Drupal sites locally on php 5.2 version and had no problems hosting them also. Recently I hosted one site that was working perfectly locally and on dreamhost but when I moved it to webfaction I received some errors.
I search the forums and found that it was due to php 5.4 version on webfaction. So I thought lets switch back to the old version of php without creating a new app
It is very simple. Just open your .htaccess file and add these lines