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<?php $f = NAN; var_dump(++$f); // float NAN var_dump((float) NAN); // float NAN var_dump((int) NAN); // int -2147483648 -> what? var_dump((bool) NAN); // bool true -> makes sense $f = INF; var_dump(++$f); // float INF var_dump((float) INF); // float INF var_dump((int) INF); // int 0 -> what? var_dump((bool) INF); // bool true -> so why int 0? var_dump((int) (bool) INF); // int 1
Output for git.master, git.master_jit, rfc.property-hooks
float(NAN) float(NAN) int(0) bool(true) float(INF) float(INF) int(0) bool(true) int(1)

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