Firebird PDO heap corruption

gistfile1.txt

<?php
try
{
	$dbh = new PDO('firebird:host=localhost;dbname=C:\\phpbb_test_data\\tests.fdb', 'SYSDBA', 'masterkey');
	for($i = 0; $i < 1000; $i++)
	{
		$statement = $dbh->prepare('INSERT INTO "PHPBB_USERS" ("USER_ID", "USERNAME", "USERNAME_CLEAN", "USER_PERMISSIONS", "USER_SIG", "USER_OCC", "USER_INTERESTS") VALUES (?, ?, ?, ?, ?, ?, ?)');
		$statement->execute(array (0 => '2', 1 => 'banned', 2 => 'banned', 3 => '', 4 => '', 5 => '', 6 => ''));
		echo 'Statement run: ' . $i . "\n";
	}
}
catch (PDOException $e)
{
	echo 'Exception: ' . $e->getMessage();
}
EOF

Output:
C:\Apache24\htdocs>php test2.php
Statement run: 0
Statement run: 1
Statement run: 2
Statement run: 3
Statement run: 4
Statement run: 5
Statement run: 6
Statement run: 7
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zend_mm_heap corrupted

C:\Apache24\htdocs>