Often times during development, a PHP page will suddenly display a blank white page. For those of you who don’t know this, it can be very helpful to toggle error display to allow you to view why PHP is showing nothing. The quickest way to do this-if you’re unfamiliar with log files-is to enable PHP to display errors by using .htaccess. Simply add this line to your .htaccess file:
That should do it. Now when you visit the blank error page, you should see some information on why PHP so cowardly quit building your page. Don’t forget to turn the value back off if you’re site is in production, though.

wishy
2010.07.02
as someone just starting with php and wordpress this is the best thing i have found – thank you so much!