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 ffi main interface to c code and data php xmldiff the xmldiff memory class php sequence allocates enough memory for a required capacity php 范例 a complete php/ffi/preloading example php ffi 范例 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 creates an ffi ctype object from a c declaration php ffi gets the ffi ctype of ffi cdata php apc 函数 retrieves apc s shared memory allocation information php maxdb 函数 frees the memory associated with a result php maxdb 函数 frees stored result memory for the given statement handle php mssql 函数 free result memory php semaphore 函数 creates or open a shared memory segment php com 函数 compares two variants php swoole buffer write data to the memory buffer. the memory allocated for the buffer will not be changed.php syncsharedmemory returns the size of the named shared memory php syncsharedmemory copy data to named shared memory