Detect connection abort on a socket opened by fsockopen()

Question

I am using fsockopen() to send data via TCP to a remote host:

$s = fsockopen($host, $port);
fwrite($s, $data);
fclose($s);

How can I detect afterwards if the connection was closed (with a FIN) or aborted (with a RST) by the remote host?

Answer 1

According to the documentation socket_last_error() and socket_send() can be helpful for you:

socket_send() returns the number of bytes sent, or FALSE on error. 
socket_last_error() returns the last error on the socket  

I believe, that PHP is able to detect if the connection was closed, however not sure about this.