Returns most recent OpenSSL error reported on the buffer event

# EventBufferEvent::sslError

(PECL event >= 1.2.6-beta)

EventBufferEvent::sslError — Returns most recent OpenSSL error reported on the buffer event

### 说明

public function EventBufferEvent::sslError(): string

Returns most recent OpenSSL error reported on the buffer event.

> 注意:

> This function is available only if `Event` is compiled with OpenSSL support.

### 参数

此函数没有参数。

### 返回值

Returns OpenSSL error string reported on the buffer event, or `false`, if there is no more error to return.

### 示例

示例 #1 EventBufferEvent::sslError() example

    <?php
    // This callback is invoked when some event occurs on the event listener,
    // e.g. connection closed, or an error occurred
    function ssl_event_cb($bev, $events, $ctx) {
        if ($events & EventBufferEvent::ERROR) {
            // Fetch errors from the SSL error stack
            while ($err = $bev->sslError()) {
                fprintf(STDERR, "Bufferevent error %s.\n", $err);
            }
        }

        if ($events & (EventBufferEvent::EOF | EventBufferEvent::ERROR)) {
            $bev->free();
        }
    }
    ?>

### 参见

- EventBufferEvent::sslRenegotiate() - Tells a bufferevent to begin SSL renegotiation

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