(PHP 7 >= 7.4.0)
FFI::memcmp — Compares memory areas
The start of one memory area.
The start of another memory area.
The number of bytes to compare.
Returns < 0 if the contents of the memory area starting at
are considered less than the contents of the memory area starting at
> 0 if the contents of the first memory area are considered greater than the second,
and 0 if they are equal.