function node_block_list_alter

Implements hook_block_list_alter().

Check the content type specific visibilty settings. Remove the block if the visibility conditions are not met.

File

modules/node/node.module, line 2508

Code

function node_block_list_alter(&$blocks) {
    global $theme_key;
    // 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] = TRUE;
    }
    $node = menu_get_object();
    $node_types = node_type_get_types();
    if (arg(0) == 'node' && arg(1) == 'add' && arg(2)) {
        $node_add_arg = strtr(arg(2), '-', '_');
    }
    foreach ($blocks as $key => $block) {
        if (!isset($block->theme) || !isset($block->status) || $block->theme != $theme_key || $block->status != 1) {
            // This block was added by a contrib module, leave it in the list.
            continue;
        }
        // If a block has no node types associated, it is displayed for every type.
        // For blocks with node types associated, if the node type does not match
        // the settings from this block, remove it from the block list.
        if (isset($block_node_types[$block->module][$block->delta])) {
            if (!empty($node)) {
                // This is a node or node edit page.
                if (!isset($block_node_types[$block->module][$block->delta][$node->type])) {
                    // This block should not be displayed for this node type.
                    unset($blocks[$key]);
                    continue;
                }
            }
            elseif (isset($node_add_arg) && isset($node_types[$node_add_arg])) {
                // This is a node creation page
                if (!isset($block_node_types[$block->module][$block->delta][$node_add_arg])) {
                    // 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;
            }
        }
    }
}