访问套接字时如何设置超时时间? [英] How can I set time out for fread when access socket?
问题描述
以下是我的代码.我希望当几秒钟后没有数据可读取时,fread可以返回.我叫stream_set_timeout.但这是行不通的.我也叫stream_get_meta_data.它还没有满足我的需求.我正在连接chat.facebook.com.
The following is my code. I wish fread can return when there don't have data to read after some seconds. I called stream_set_timeout. But it don't work. And I called stream_get_meta_data too. It don't give my need yet. I am connecting chat.facebook.com.
$fp = fsockopen($server, 8888, $errno, $errstr);
stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);
fwrite($fp, $xml);
stream_set_timeout($fp, 5);
$str = fread($fp,8192);//This code will hang when there don't have data to read.
推荐答案
如果您阅读了stream_set_timeout()
的手册,就会知道stream_set_timeout()
在超时情况下唯一要做的就是设置'timed_out' stream_get_meta_data()
返回的数组的键为true.
If you'd read the manual for stream_set_timeout()
you'd know that the only thing stream_set_timeout()
does in case of timeout is setting of 'timed_out' key of the array returned by stream_get_meta_data()
to true.
stream_set_timeout($fp, 5);
// set stream into non-blocking mode
stream_set_blocking($fp, false);
$break_counter = 0;
$result = '';
$info = stream_get_meta_data($fp);
while (!$info['timed_out'] && !feof($fp)) {
$str = @fgets($fp, 1160);
if ($str) {
$result .= $str;
} else {
$break_counter += 1;
if ($break_counter > 100) {
break;
}
// 10000*100 microseconds gives you one second
usleep(10000);
}
$info = stream_get_meta_data($fp);
}
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