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    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(): 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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