Reproducing Script:
<?php
class Test {
private $fp;

public function __construct() {
$this->fp = fopen('test', 'w');
}

public function __destruct() {
fputs($this->fp, 'test');
fclose($this->fp);
}
}

$test = new Test;
?>

Stacktrace:
add_stack_frame(_zend_execute_data 0x0012f478, _zend_op_array 0x00dd12f0, int 2, void 0x00db4248) line 687 + 21 bytes
xdebug_execute(_zend_op_array 0x00dd12f0, void 0x00db4248) line 843 + 19 bytes
zend_call_function(_zend_fcall_info 0x0012f584, _zend_fcall_info_cache 0x0012f550, void 0x00db4248) line 739 + 33 bytes
zend_call_method(_zval_struct 0x0012f638, _zend_class_entry 0x00dd07a8, _zend_function 0x00000000, char 0x105c0684 string', int 10, _zval_struct * * 0x00000000, int 0, _zval_struct * 0x00000000, _zval_struct * 0x00000000, void * * * 0x00db4248) line 79 + 17 bytes zend_objects_destroy_object(_zend_object * 0x00dd1530, unsigned int 1, void * * * 0x00db4248) line 79 + 36 bytes zend_objects_store_del_ref(_zval_struct * 0x00dd28e8, void * * * 0x00db4248) line 142 + 22 bytes _zval_dtor(_zval_struct * 0x00dd28e8, char * 0x105c3438string', unsigned int 355) line 61 + 19 bytes
_zval_ptr_dtor(_zval_struct 0x00dd1d64, char 0x105ce090 `string', unsigned int 196) line 355 + 27 bytes
_zval_ptr_dtor_wrapper(_zval_struct 0x00dd1d64) line 196 + 25 bytes
zend_hash_apply_deleter(_hashtable 0x00e002d0, bucket 0x00dd1d58) line 568 + 15 bytes
zend_hash_graceful_reverse_destroy(_hashtable 0x00e002d0) line 634 + 13 bytes
shutdown_executor(void 0x00db4248) line 211 + 26 bytes
zend_deactivate(void 0x00db4248) line 812 + 9 bytes
php_request_shutdown(void 0x00000000) line 1242 + 9 bytes
main(int 2, char * 0x00db2c48) line 1028 + 10 bytes
mainCRTStartup() line 338 + 17 bytes