Western Massachusetts Drupal Camp 2011

The most fun lesson learned– passing in a pure integer to the $block['content'] in the implementation of hook_block_view causes an unsupported operand error so deep in the block rendering system the stack trace doesn't even know where it came from.

<?php
/**
 * Implements hook_block_info().
 */
function dgd7glue_block_info() {
  $blocks = array();
  $blocks['twoplustwo'] = array(
    'info' => t('Two plus two.'),
  );
  return $blocks;
}