[php-src] Issue #13531: Unable to resize SplfixedArray after being unserialized in PHP 8.2.15

Issue: https://github.com/php/php-src/issues/13531 Author: codex-m ### Description The following code: ```php <?php ini_set('display_errors', 1); ini_set('display_startup_errors', 1); ini_set('error_reporting', E_ALL); echo "============" . "<br />"; echo "Testing in " . phpversion() . "<br />"; echo "============"; echo "<br /><br />"; /** * Create 5 items */ $array = new SplFixedArray(5); /** * Get size * EXPECTED: 5 */ $size = $array->getSize(); echo "Original size before serializing. Expected result is 5." . "<br />"; echo "Actual result: $size"; echo "<br /><br />"; /** * Serialize SPLFixedArray object */ $serialized = serialize($array); /** * Unserialize SPLFixedArray object */ $array = unserialize($serialized); /** * Get size * EXPECTED: 5 */ $size = $array->getSize(); echo "Original size after serializing. Expected is still 5." . "<br />"; echo "Actual result is $size"; echo "<br /><br />"; /** * Resize SPLFixedArray to 6 items */ echo "Resizing array to 6 items" . "<br />"; $array->setSize(6); /** * Get size after resize * EXPECTED: 6 */ $size = $array->getSize(); echo "Updated size after resize. " . "<em>" . "Expected is 6." . "</em>" . "<br />"; echo "<strong>" . "Actual result is $size" . "</strong>"; echo "<br />"; ``` Resulted in this output: ``` ============ Testing in 8.2.15 ============ Original size before serializing. Expected result is 5. Actual result: 5 Original size after serializing. Expected is still 5. Actual result is 5 Resizing array to 6 items Updated size after resize. Expected is 6. Actual result is 5 ``` But I expected this output instead: ``` ============ Testing in 8.2.15 ============ Original size before serializing. Expected result is 5. Actual result: 5 Original size after serializing. Expected is still 5. Actual result is 5 Resizing array to 6 items Updated size after resize. Expected is 6. Actual result is 6 ``` Additional notes: - This is only reproducible with PHP 8.2.15. - It works well with PHP 8.1/8.0/7.4. I've checked the docs on changes with setSize() method with PHP 8.2. It does not mention that it cannot be used after unserializing. So I open this ticket as it could be a bug. Thank you! ### PHP Version PHP 8.2.15 ### Operating System Ubuntu 22.04 LTS