Description:
------------
Attempting to 'var_dump' a PDOStatement object within a function, and then calling 'die' using PDO_MYSQL. MySQL query at the top is just incase you need to test it with that to, though I can re-produce this with any table and MySQL database.

Reproduce code:
---------------
CREATE TABLE foobar (
  zomg varchar(255) NOT NULL,
  KEY zomg (zomg)
) TYPE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

<?php

	function foo( $bar ) {
		var_dump( $bar );
		// Removing the following line stops the segfault from happening
		die;
	}
	
	$sql = new PDO( 'mysql:host=localhost;dbname=DATABASE', 'USER', 'PASS' );
	$pdo_st = $sql->prepare( 'SELECT * FROM foobar' );

	foo( $pdo_st );
		
?>

Expected result:
----------------
object(PDOStatement)#2 (1) { ["queryString"]=>  string(39) "SELECT * FROM foobar WHERE zomg = :zomg" }

Actual result:
--------------
Output from gdb (unable to enable debug within PHP)

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7b5c910 (LWP 3489)]
0xb706323d in mysql_more_results () from /usr/lib/libmysqlclient.so.15
(gdb) bt
#0  0xb706323d in mysql_more_results () from /usr/lib/libmysqlclient.so.15
#1  0xb6eb6911 in free_statement (stmt=0x991c870) at /tmp/pear/temp/PDO/pdo_stmt.c:2200
#2  0xb6eb6a9d in pdo_dbstmt_free_storage (stmt=0x991c870) at /tmp/pear/temp/PDO/pdo_stmt.c:2245
#3  0xb78921ed in zend_objects_store_free_object_storage () from /etc/httpd/modules/libphp5.so
#4  0xb786b013 in shutdown_executor () from /etc/httpd/modules/libphp5.so
#5  0xb7875783 in zend_deactivate () from /etc/httpd/modules/libphp5.so
#6  0xb7833547 in php_request_shutdown () from /etc/httpd/modules/libphp5.so
#7  0xb78e0cc1 in php_handler () from /etc/httpd/modules/libphp5.so
#8  0x0807be49 in ap_run_handler ()
#9  0x0807f1b1 in ap_invoke_handler ()
#10 0x0808a496 in ap_process_request ()
#11 0x080875c8 in ?? ()
#12 0x0997fc00 in ?? ()
#13 0x00000004 in ?? ()
#14 0x0997fc00 in ?? ()
#15 0x00000000 in ?? ()