block_block_info_alter

Versions

mediamosa-21

block_block_info_alter(&$blocks)

Implements hook_block_info_alter().

Check the page, user role, content type and user specific visibilty settings. Remove the block if the visibility conditions are not met.

Code

modules/block/block.module, line 642

<?php
function block_block_info_alter(&$blocks) {
  global $user, $theme_key;

  // Build an array of roles for each block.
  $block_roles = array();
  $result = db_query('SELECT module, delta, rid FROM {block_role}');
  foreach ($result as $record) {
    $block_roles[$record->module][$record->delta][] = $record->rid;
  }

  // Build an array of node types for each block.
  $block_node_types = array();
  $result = db_query('SELECT module, delta, type FROM {block_node_type}');
  foreach ($result as $record) {
    $block_node_types[$record->module][$record->delta][] = $record->type;
  }

  foreach ($blocks as $key => $block) {
    if ($block->theme != $theme_key || $block->status != 1) {
      // This block was added by a contrib module, leave it in the list.
      continue;
    }

    // If a block has no roles associated, it is displayed for every role.
    // For blocks with roles associated, if none of the user's roles matches
    // the settings from this block, remove it from the block list.
    if (isset($block_roles[$block->module][$block->delta]) && !array_intersect($block_roles[$block->module][$block->delta], array_keys($user->roles))) {
      // No match.
      unset($blocks[$key]);
      continue;
    }

    // If a block has no node types associated, it is displayed for every type.
    // For blocks with node types associated, if the node type does not match
    // the settings from this block, remove it from the block list.
    if (isset($block_node_types[$block->module][$block->delta])) {
      $node = menu_get_object();
      if (!empty($node)) {
        // This is a node or node edit page.
        if (!in_array($node->type, $block_node_types[$block->module][$block->delta])) {
          // This block should not be displayed for this node type.
          unset($blocks[$key]);
          continue;
        }
      }
      elseif (arg(0) == 'node' && arg(1) == 'add' && in_array(arg(2), array_keys(node_type_get_types()))) {
        // This is a node creation page
        if (!in_array(arg(2), $block_node_types[$block->module][$block->delta])) {
          // This block should not be displayed for this node type.
          unset($blocks[$key]);
          continue;
        }
      }
      else {
        // This is not a node page, remove the block.
        unset($blocks[$key]);
        continue;
      }
    }

    // Use the user's block visibility setting, if necessary.
    if ($block->custom != 0) {
      if ($user->uid && isset($user->block[$block->module][$block->delta])) {
        $enabled = $user->block[$block->module][$block->delta];
      }
      else {
        $enabled = ($block->custom == 1);
      }
    }
    else {
      $enabled = TRUE;
    }
    if (!$enabled) {
      unset($blocks[$key]);
      continue;
    }

    // Match path if necessary.
    if ($block->pages) {
      if ($block->visibility < 2) {
        $path = drupal_get_path_alias($_GET['q']);
        // Compare with the internal and path alias (if any).
        $page_match = drupal_match_path($path, $block->pages);
        if ($path != $_GET['q']) {
          $page_match = $page_match || drupal_match_path($_GET['q'], $block->pages);
        }
        // When $block->visibility has a value of 0, the block is displayed on
        // all pages except those listed in $block->pages. When set to 1, it
        // is displayed only on those pages listed in $block->pages.
        $page_match = !($block->visibility xor $page_match);
      }
      elseif (module_exists('php')) {
        $page_match = php_eval($block->pages);
      }
      else {
        $page_match = FALSE;
      }
    }
    else {
      $page_match = TRUE;
    }
    if (!$page_match) {
      unset($blocks[$key]);
    }
  }
}
?>