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Out of curiousity, I’m reading the Zend Engine API code and encountered quite a number of ## in their #define’s. For example, at /usr/lib/php5/Zend/zend_API.h:
#define ZEND_FN(name) zif_##name #define ZEND_MN(name) zim_##name What does the ## (double hash) symbols mean in these two lines?
The ## concatenates what’s before the ## with what’s after it. So in your example doing
ZEND_FN(foo)would result inzif_foo