Drupal 7 Module Development

Creating Your First Module
Here's our 'block info' hook implementation declaring a single block:
/**
* Implements hook_block_info().
*/
function first_block_info() {
$blocks = array();
$blocks['list_modules'] = array(
'info' => t('A listing of all of the enabled modules.'),
'cache' => DRUPAL_NO_CACHE,
);
}
return $blocks;
Once again, this function is preceded by a doc block. And since we are writing
a trivial implementation of hook_block_info(), we needn't add anything other
than the standard documentation.
An implementation of hook_block_info() takes no arguments and is expected
to return an associative array.
Associative arrays: Drupal's data structure of choice
Arrays in PHP are very fast. They are well supported, and because they
serve double duty as both indexed arrays and dictionary-style associative
arrays, they are flexible. For those reasons Drupal makes heavy use of
arrays—often in places where one would expect objects, linked lists,
maps, or trees.
The returned array should contain one entry for every block that this module declares,
and the entry should be of the form $name => array($property => $value).
Thus, the important part of our function above is this piece:
$blocks['list_modules'] = array(
'info' => t('A listing of all of the enabled modules.'),
'cache' => DRUPAL_NO_CACHE,
);
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