PHP マニュアル: Compares memory areas

説明

public static int FFI::memcmp(stringFFI\CData &$ptr1, stringFFI\CData &$ptr2, int $size)

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.

パラメータ

ptr1: The start of one memory area.
ptr2: The start of another memory area.
size: The number of bytes to compare.

戻り値

Returns a value less than 0 if the contents of the memory area starting at ptr1 are considered less than the contents of the memory area starting at ptr2, a value greater than 0 if the contents of the first memory area are considered greater than the second, and 0 if they are equal.