phpstream_socket_pair

stream_socket_pair&＃xff0c;他的作用是创建一对完全一样的网络套接字连接流 &＃xff0c;通常会被用在进程间的通信具体参数这里不再讲述&＃xff0c;文档里都有&＃xff0c;我们解释一下文档中的例子

?php$sockets &＃61; stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$pid &＃61; pcntl_fork();if ($pid &＃61;&＃61; -1) {die(&＃39;could not fork&＃39;);} else if ($pid) {/* parent */fclose($sockets[0]);fwrite($sockets[1], "child PID: $pid\n");echo fgets($sockets[1]);fclose($sockets[1]);} else {/* child */fclose($sockets[1]);fwrite($sockets[0], "message from child\n");echo fgets($sockets[0]);fclose($sockets[0]);
}?>

上面的例子输出如下&＃xff1a;

child PID: 1378
message from child

解释下例子
首先执行这段程序的进程先产生一对连接&＃xff0c;然后fork一个新的进程&＃xff0c;主进程往$socket[1]中写入消息"child PID: $pid\n");
然后子进程会往$sockets[0]中写入消息message from child\n&＃xff0c;并读出$socket[1]中的消息&＃xff0c;同时主进程也能接受到子进程写入的消息
这样就实现了进程间的通信
另外&＃xff0c;产生的这对连接在同一进程下也可以通信

$sockets &＃61; stream_socket_pair ( STREAM_PF_UNIX , STREAM_SOCK_STREAM , STREAM_IPPROTO_IP );
$pid &＃61; pcntl_fork ();if ( $pid &＃61;&＃61; - 1 ) {
die( &＃39;could not fork&＃39; );} else if ( $pid ) {
/* parent */
//fclose ( $sockets [ 0 ]);fwrite ( $sockets [ 1 ], "child PID: $pid \n" );
fwrite ( $sockets [ 0 ], "message from child\n" );echo &＃39;main-&＃39;.fgets ( $sockets [ 1 ]);
echo &＃39;child-&＃39;.fgets ( $sockets [ 0 ]);
fclose ( $sockets [ 0 ]);
fclose ( $sockets [ 1 ]);}
?>