Drupal Search module customisation to allow display priority settings for each content type (to allow showing certain types first in the default search module)

gistfile1.php

function HOOK_ranking() {
  $rankings = array();
  $types = node_type_get_types();
  foreach ($types as $type) {
    $rankings[$type->type . '_node_type_boost_search'] = array(
      'title' => t('Boost "' . $type->name . '" nodes'),
      'arguments' => array(':type' => $type->type),
      'score' => ' FIND_IN_SET(n.type, :type)',
    );
  }
  return $rankings;
}