The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
GMP_ROUND_ZERO (int) GMP_ROUND_PLUSINF (int) GMP_ROUND_MINUSINF (int) GMP_MSW_FIRST (int) GMP_LSW_FIRST (int) GMP_LITTLE_ENDIAN (int) GMP_BIG_ENDIAN (int) GMP_NATIVE_ENDIAN (int) GMP_VERSION (string)