Invoke a block and render it (Drupal 7)

block_render.php

/**
*Render a block
*/
function block_render($module, $block_id) {
  $block = block_load($module, $block_id);
  if(!isset($block->title)){
    $block->title = '';
  }
  if(!isset($block->region)){
    $block->region = '';
  }
  $block_content = _block_render_blocks(array($block));  
  $build = _block_get_renderable_array($block_content);
  $block_rendered = drupal_render($build);
  return $block_rendered;
}

 $block_rendered = block_render('block', 'BLOCK_ID');
 // print $block_rendered;