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we've only discussed the so-called *_ex() api so far. you may have noticed that the api functions we've used are called zend_get_parameters_ex() instead of zend_get_parameters(), convert_to_long_ex() instead of convert_to_long(), etc. the *_ex() functions form the so-called new "extended" zend api. they give a minor speed increase over the old api, but as a tradeoff are only meant for providing read-only access.
write access to a zval container requires this container to contain an isolated value, meaning a value that 's not referenced by any other containers.