FFI::memcmp
(PHP 7 >= 7.4.0, PHP 8)
FFI::memcmp — Compares memory areas
说明
Compares size bytes from the memory areas ptr1 and
ptr2. Both ptr1 and ptr2
can be any native data structures (FFI\CData) or PHP
strings.
参数
-
ptr1 -
The start of one memory area.
-
ptr2 -
The start of another memory area.
-
size -
The number of bytes to compare.
返回值
Returns < 0 if the contents of the memory area starting at ptr1
are considered less than the contents of the memory area starting at ptr2,
> 0 if the contents of the first memory area are considered greater than the second,
and 0 if they are equal.
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