static zend_always_inline int zend_array_dup_element(HashTable *source, HashTable *target, uint32_t idx, Bucket *p, Bucket *q, int packed, int static_keys, int with_holes)
{
	zval *data = &p->val;

	if (with_holes) {
		if (!packed && Z_TYPE_INFO_P(data) == IS_INDIRECT) {
			data = Z_INDIRECT_P(data);
		}
		if (UNEXPECTED(Z_TYPE_INFO_P(data) == IS_UNDEF)) {
			return 0;
		}
	} else if (!packed) {
		/* INDIRECT element may point to UNDEF-ined slots */
		if (Z_TYPE_INFO_P(data) == IS_INDIRECT) {
			data = Z_INDIRECT_P(data);
			if (UNEXPECTED(Z_TYPE_INFO_P(data) == IS_UNDEF)) {
				return 0;
			}
		}
	}

	do {
		if (Z_OPT_REFCOUNTED_P(data)) {
			if (Z_ISREF_P(data) && Z_REFCOUNT_P(data) == 1 &&
			    (Z_TYPE_P(Z_REFVAL_P(data)) != IS_ARRAY ||
			      Z_ARRVAL_P(Z_REFVAL_P(data)) != source)) {
				data = Z_REFVAL_P(data);
				if (!Z_OPT_REFCOUNTED_P(data)) {
					break;
				}
			}
			Z_ADDREF_P(data);
		}
	} while (0);
	ZVAL_COPY_VALUE(&q->val, data);

	q->h = p->h;
	if (packed) {
		q->key = NULL;
	} else {
		uint32_t nIndex;

		q->key = p->key;
		if (!static_keys && q->key) {
			zend_string_addref(q->key);
		}

		nIndex = q->h | target->nTableMask;
		Z_NEXT(q->val) = HT_HASH(target, nIndex);
		HT_HASH(target, nIndex) = HT_IDX_TO_HASH(idx);
	}
	return 1;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.