tcp_readn()

读取指定保存长度的TCP会话（session）的数据

Description

int tcp_readn(int $tcp_id, string &$rbuf, int $rlen)

Parameters

$tcp_id: 接收数据的TCP会话（session）账号
$rbuf: 接收数据保存的缓冲器
$rlen: 接收数据的大小，读取接收此大小以上数据

Return Value

成功时读取数据大小（字节数），失败时 0

Example

<?php
include "/lib/sn_tcp_ac.php";
$port = 1470;
tcp_server(0, $port);               // listenning as a server
$rbuf = "";
while(1)
{
  $rlen = tcp_readn(0, $rbuf, 100); // If there are data equal to or more than 100, it copies 100 bytes of data to the $rbuf and returns 100
  if($rlen > 0)
    echo "$rbuf\r\n";
}
?>

See also