如何用socket_recvfrom读取套接字数据？
问题描述：
I need to get information from UDP socket, but the fact that i do not know how many answers will receive so i decided to wait for a few seconds. The main problem is that socket_recvfrom blocks and all the code stuck... Is there some way to wait for a few second and stop the socket?
My code:
$end_time = time() + 2;
while ($end_time > time()) {
socket_recvfrom($socket, $buffer, 2500, 0, $from, $port);
var_dump($buffer);
}
答
You can set the function to non blocking mode using the MSG_DONTWAIT flag:
$end_time = time() + 2;
while ($end_time > time()) {
socket_recvfrom($socket, $buffer, 2500, 0, $from, $port, MSG_DONTWAIT);
var_dump($buffer);
// sleep 500ms to decrease cpu usage
usleep(500000);
}