php socket not disconnect client with android

i used stream_socket_server() i not receive msg in server with status disconnect form android closing connection

if close google chrome is normal receive disconnect msg

if disable wi-fi and 5g lost disconnect msg

if(strlen($socket) == 8 || strlen($socket) == 0):

is possible resolve problem?

how check status of client for disconnect…
check list of lcients in new handshake one solution?

one solution for check status client ofr disconnect he