- PHP Manual
- SyncSharedMemory
- Check to see if the object is the first instance system-wide of named shared memory
SyncSharedMemory::first
(PECL sync >= 1.1.0)
SyncSharedMemory::first — Check to see if the object is the first instance system-wide of named shared memory
説明
public SyncSharedMemory::first
( void
) : bool
Retrieves the system-wide first instance status of a SyncSharedMemory object.
パラメータ
この関数にはパラメータはありません。
返り値
A boolean of TRUE if the object is the first instance system-wide, FALSE otherwise.
例
例1 SyncSharedMemory::first() example
<?php
$mem = new SyncSharedMemory("AppReportName", 1024);
if ($mem->first())
{
// Do first time initialization work here.
}
var_dump($mem->first());
$mem2 = new SyncSharedMemory("AppReportName", 1024);
var_dump($mem2->first());
?>
上の例の出力は、 たとえば以下のようになります。
bool(true) bool(false)
参考
- SyncSharedMemory::write() - Copy data to named shared memory
- SyncSharedMemory::read() - Copy data from named shared memory