When working on custom Drupal modules in PHP, one commonly experiences the dreaded White Screen of Death (WSoD). The Drupal community has documented the Drupal WSoD extensively at http://drupal.org/node/158043.
Typically, everything seems fine, and then the Drupal-based web site you are working on (on your local machine) suddenly becomes completely broken, it gives a blank page for any request. Usually I cannot remember even what inconsequential-seeming things I have just changed. The tricks of this post are for directly tracking the down the error with a debugger, by watching it occur. [There is an even better method for this example, described at the end of this post.]
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