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

说明

public SyncSharedMemory::first ( void ) : bool

Retrieves the system-wide first instance status of a SyncSharedMemory object.

参数

此函数没有参数。

返回值

A boolean of TRUE if the object is the first instance system-wide, FALSE otherwise.

范例

Example #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());
?>

以上例程的输出类似于：

bool(true)
bool(false)

参见

SyncSharedMemory::write() - Copy data to named shared memory
SyncSharedMemory::read() - Copy data from named shared memory