The 7th Annual China PHP Conference

SyncSharedMemory::read

(PECL sync >= 1.1.0)

SyncSharedMemory::readCopy data from named shared memory

Описание

public SyncSharedMemory::read ([ int $start = 0 [, int $length ]] )

Copies data from named shared memory.

Список параметров

start

The start/offset, in bytes, to begin reading.

Замечание:

If the value is negative, the starting position will begin at the specified number of bytes from the end of the shared memory segment.

length

The number of bytes to read.

Замечание:

If unspecified, reading will stop at the end of the shared memory segment.

If the value is negative, reading will stop the specified number of bytes from the end of the shared memory segment.

Возвращаемые значения

A string containing the data read from shared memory.

Примеры

Пример #1 SyncSharedMemory::__construct() example

<?php
// You will probably need to protect shared memory with other synchronization objects.
// Shared memory goes away when the last reference to it disappears.
$mem = new SyncSharedMemory("AppReportName"1024);
if (
$mem->first())
{
    
// Do first time initialization work here.
}

$result $mem->write("report.txt");

$result $mem->read(3, -4);
var_dump($result);
?>

Результатом выполнения данного примера будет что-то подобное:

string(3) "ort"

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