Identify any unserialization issues in Drupal to we can resolve them

drupal_var_fix.php

#!/usr/bin/env drush

# Once it prints the faulty variable names, just re-set the values using `drush vset {variable_name} "{value}"

$variables = db_query('SELECT name, value FROM {variable}')->fetchAllKeyed();

foreach ($variables as $key => $val) {
  $v = unserialize($val);

  if ($v === FALSE && $val !== 'b:0;') {
    print "Error unserializing '$key' (val = $val )\n";
  }

}