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 function SyncSharedMemory::first(): bool

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

参数

此函数没有参数。

返回值

成功时返回 true， 或者在失败时返回 false。

示例

示例 #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());
?>

以上示例的输出类似于：

bool(true)
bool(false)

参见