system_block_view_system_main_block_alter(array &$build, BlockPluginInterface $block)
Implements hook_block_view_BASE_BLOCK_ID_alter().
function system_block_view_system_main_block_alter(array &$build, BlockPluginInterface $block) { // Contextual links on the system_main block would basically duplicate the // tabs/local tasks, so reduce the clutter. unset($build['#contextual_links']); }
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https://api.drupal.org/api/drupal/core!modules!system!system.module/function/system_block_view_system_main_block_alter/8.1.x