phongo_bson_append() currently handles zval reference and indirect types. References are passed through ZVAL_DEREF() as-needed, and indirect types are routed through Z_INDIRECT_P(). The ZEND_HASH_FOREACH macros already have variants to automatically handled indirect types (e.g. ZEND_HASH_FOREACH_VAL_IND), so we should consider using those everywhere we iterate in PHP7.