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

相关文章
php evloop creates evstat watcher object associated with the current event loop instancephp hyperwave api 函数 creates a new instance of class hwapi object newphp imap 函数 check if the imap stream is still activephp mcve 函数 check to see if a transaction has completedphp mcve 函数 check to see if the transaction was successfulphp mcve 函数 check to see if outgoing buffer is clearphp semaphore 函数 inserts or updates a variable in shared memoryphp imagick checks if the object has more imagesphp intlchar check if code point is a graphic characterphp intlchar check if code point is permissible as the first character in an identifierphp intlchar check if code point is permissible as the first character in a java identifierphp intlchar check if code point has the general category lu uppercase letter php memcached check if the instance was recently createdphp mysql xdevapi databaseobject check if object exists in databasephp shared memory shared memory 函数php sdo 函数 test to see if the property is many valuedphp syncsharedmemory check to see if the object is the first instance system wide of named shared memoryphp syncsharedmemory copy data from named shared memoryphp syncsharedmemory returns the size of the named shared memoryphp syncsharedmemory copy data to named shared memory
关注编程学问公众号