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PHP - Manual: SyncSharedMemory::first - 互联网笔记

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PHP - Manual: SyncSharedMemory::first

2025-06-01

SyncSharedMemory::first

(PECL sync >= 1.1.0)

SyncSharedMemory::firstCheck to see if the object is the first instance system-wide of named shared memory

说明

public 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

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官方地址:https://www.php.net/manual/en/syncsharedmemory.first.php

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