PHP Manual
FFI
Compares memory areas

FFI::memcmp

(PHP 7 >= 7.4.0)

FFI::memcmp — Compares memory areas

说明

public static FFI::memcmp ( mixed &$ptr1 , mixed &$ptr2 , int $size ) : int

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.

php 范例 a complete php/ffi/preloading example php ffi 范例 php ffi releases an unmanaged data structure php ffi compares memory areas php ffi copies one memory area to another php ffi fills a memory area php ffi creates a php string from a memory area php ffi gets the ffi ctype of ffi cdata php firebird/interbase 函数 free memory allocated by a prepared query php maxdb 函数 frees stored result memory for the given statement handle php mssql 函数 free result memory php mssql 函数 free statement memory php semaphore 函数 creates or open a shared memory segment php semaphore 函数 disconnects from shared memory segment php com 函数 compares two variants php wincache 函数 retrieves information about file cache memory usage php shared memory 安装／配置 php swoole lock construct a memory lock.php syncsharedmemory copy data to named shared memory php xmldiff memory diff two xml documents