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# SAMConnection->unsubscribe()

(no version information, might be only in CVS)

SAMConnection->unsubscribe() -- Cancel a subscription to a specified topic.

## 说明

class SAMConnection {
bool unsubscribe ( string subscriptionId [, string targetTopic] )
}

The "unsubscribe" method is used to delete an existing subscription to a specified topic.

## 参数

`subscriptionId`

  The identifier of an existing subscription as returned by a call to the subscribe method.

## 返回值

This method returns `FALSE` if an error occurs.

## 范例

例 1. Delete a subscription

`<?php if (!$conn->unsubscribe($subid)) { // The unsubscribe failed! echo "Unsubscribe failed ($conn->errno) $conn->error"; } ?>`

## 参见

SAMConnection->subscribe()

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SAMConnection->subscribe() | 上一级 | SAMMessage->body