[php-src] Issue #20936: undefined behavior in zend_API.c

Issue: https://github.com/php/php-src/issues/20936
Author: chongwick

### Description

The following code:

```php
<?php
$v_973 = '2022-07-16 12:00:00';
$v_974 = 'UTC';
$v_975 = new DateTimeZone($v_974,);
$v_976 = new DateTime($v_973,$v_975,);
$v_978 = null;
$v_980 = 'P2D';
$v_981 = new DateInterval($v_980,);
$v_983 = 2;
$v_985 = False;
$v_987 = True;
$v_966 = array('start' => $v_988,'end' => $v_976,'current' => $v_978,'interval' => $v_981,'recurrences' => $v_983,'include_start_date' => $v_985,'include_end_date' => $v_987,);
$v_988 = DatePeriod::__set_state($v_966,);
$v_989 = var_dump($v_988,);
```

Resulted in this output:
```
/home/w023dtc/nightly_php/php-src/Zend/zend_API.c:1794:6: runtime error: member access within null pointer of type 'zend_class_entry' (aka 'struct _zend_class_entry')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/w023dtc/nightly_php/php-src/Zend/zend_API.c:1794
```



### PHP Version

```plain
nightly
```

### Operating System

ubuntu 22.04