SyncSharedMemory::read

(PECL sync >= 1.1.0)

SyncSharedMemory::readCopy data from named shared memory

Description

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

Copies data from named shared memory.

Liste de paramètres

start

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

Note:

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.

Note:

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.

Valeurs de retour

A string containing the data read from shared memory.

Exemples

Exemple #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);
?>

Résultat de l'exemple ci-dessus est similaire à :

string(3) "ort"

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