Find corrupt values in variable table

variable-check.php

<?php

$result = db_select('variable', 'v')
  ->fields('v', array('name', 'value'))
  ->orderBy('name', 'ASC')
  ->execute()
  ->fetchAll();

$rows = array();
foreach ($result as $row) {
  $value = @unserialize($row->value);
  if ($value === FALSE && $row->value != serialize(FALSE)) {
    $rows[$row->name] = array('name' => $row->name, 'value' => $row->value);
  }
}

dpm($rows);