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표 42-1. api macros for accessing zval containers
macro

containers can also be set via the $arguments array (see below).
do not provide the actual xml or xsl content as 2nd and 3rd argument, as this will create a segmentation fault, in sablotron versions up to and including 0.95.

a set of macros was introduced into zend's api that simplify access to zval containers (see 표 42-1).
table 42-1.

because zend works internally with references, different variables may reference the same value. 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. if a zval container were referenced by other containers and you changed the referenced zval, you would automatically change the contents of the other containers referencing this zval (because they'd simply point to the changed value and thus change their own value as well).
because zend works internally with references, different variables may reference the same value.