Description:
------------
PDO firebird does not support type Boolean in input parameters

Test script:
---------------
$sql = <<<SQL
with t(b, s) as (
  select true, 'true' from rdb\$database
  union all
  select false, 'false' from rdb\$database
  union all
  select unknown, 'unknown' from rdb\$database
)
select trim(s) as s from t where b is not distinct from :p
SQL;

require 'testdb.inc';
$db = new PDO('firebird:dbname='.$test_base, $user, $password) or die;
try { 
  // PDO::PARAM_BOOL

  $query = $db->prepare($sql);
  
  $query->bindValue('p', 0, PDO::PARAM_BOOL);
  $query->execute();
  var_dump($query->fetchColumn(0));  
  
  $query->bindValue('p', 1, PDO::PARAM_BOOL);
  $query->execute();
  var_dump($query->fetchColumn(0));  
  
  $query->bindValue('p', false, PDO::PARAM_BOOL);
  $query->execute();
  var_dump($query->fetchColumn(0));   
  
  $query->bindValue('p', true, PDO::PARAM_BOOL);
  $query->execute();
  var_dump($query->fetchColumn(0));     
  echo "OK\n";
}
catch(Exception $e) {
	echo $e->getMessage() . '<br>';
	echo $e->getTraceAsString();
}

Expected result:
----------------
string(5) "false"
string(4) "true"
string(5) "false"
string(4) "true"
OK