Why is my MacBook warm when the lid is closed (in sleep mode)?

When I woke up last night it was a little windy outside, so I decided to unplug my MacBook Pro because the power tends to flicker here. When I picked up the MacBook I noticed that it was very warm, even though the lid was closed and it was in sleep mode. This morning I decided to dig into the “Why is my MacBook hot even though the lid is closed and it’s in sleep mode” question.

Drupal watchdog function - How to log Drupal errors (error messages)

Drupal FAQ: How do I log Drupal errors (error messages)?

The standard way to log Drupal error messages is with the watchdog function. The watchdog function logs your messages to your database, where you can then view them from your Drupal Reports URL.

In Drupal 6 and Drupal 7 the watchdog function has this signature: