PHP中Socket连接及读写数据超时问题分析

stream_set_blocking( $fp , false )

stream_set_timeout( $fp , 10 )

stream_get_meta_data( $fp )

Array
(
  [stream_type] => tcp_socket
  [mode] => r+
  [unread_bytes] => 0
  [seekable] =>
  [timed_out] =>
  [blocked] => 1
  [eof] =>
)

$fp = @fsockopen( $ip , $port, $errNo , $errstr, 30 );
if( !$fp )
{
  return false;
}
else
{
  stream_set_timeout( $fp , 3 ) ;
  //发送数据
  fwrite( $fp , $packet ) ;
  $status = stream_get_meta_data( $fp ) ;
  //发送数据超时
  if( $status['timed_out'] )
  {
    echo "Write time out" ;
    fclose( $fp );
    return false;
  }
  //读取数据
  $buf = fread( $fp , 16 ) ;
  $status = stream_get_meta_data( $fp ) ;
  //读取数据超时
  if( $status['timed_out'] )
  {
    echo "Read time out" ;
    fclose( $fp );
    return false;
  }
}