tcp_readn()

Reading the designated number of byte from the TCP session

Description

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

Parameters

$tcp_id: TCP session ID
$rbuf: buffer to save data
$rlen: the number data byte to read

Return Value

If there are data equal to or more than the $rlen in the TCP receiving buffer, it returns the $rlen, otherwise returns 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