(PECL sync >= 1.1.0)
SyncSharedMemory::first — Check to see if the object is the first instance system-wide of named shared memory
Retrieves the system-wide first instance status of a SyncSharedMemory object.
此函数没有参数。
成功时返回 true， 或者在失败时返回 false。
true
false
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)
