SyncSharedMemory::read
(PECL sync >= 1.1.0)
SyncSharedMemory::read — Copy data from named shared memory
Description
public SyncSharedMemory::read ([ integer $start = 0 [, integer $length ]] )Copies data from named shared memory.
Parameters
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.
Return Values
A string containing the data read from shared memory.
Examples
Example #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);
?>The above example will output something similar to:
string(3) "ort"See Also
- SyncSharedMemory::__construct() - Constructs a new SyncSharedMemory object
- SyncSharedMemory::first() - Check to see if the object is the first instance system-wide of named shared memory
- SyncSharedMemory::write() - Copy data to named shared memory
- SyncSharedMemory::read()
← SyncSharedMemory::first
SyncSharedMemory::size →
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