Drupal 7 Module Development

Node Access
// Get a list of user roles.
$roles = user_roles();
// Get our permission definitions.
$permissions = role_access_permission();
// Initiate a results variable, for theming the output.
$results = array();
// Check each access rule.
foreach (array('view', 'update', 'delete') as $op) {
if (in_array($row->gid, array_keys($roles))) {
$results[] = t('%roles with the permission %perm may %op
this content', array('%role' => $roles[$row->gid], '%perm' =>
$permissions[$op . ' role access content']['title'], '%op' => $op));
}
}
// Prepare for theming. The $results are already secure, having run
// through t().
$variables = array(
'items' => $results,
'title' => '',
'type' => 'ul',
);
// Return a nicely themed list.
return theme('item_list', $variables);
}
By providing this hook, both the developer and module users can enable Devel Node
Access to see how node access rules are being enforced.
Using the Devel Node Access by user block
The Devel Node Access module also provides a block which displays the results of
the node_access() function. This block can help you sort through the reason(s) why
access has been granted or denied. It presents a table, showing the ten most recent
site visitors and their access to a specific node.
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