check xdebug connection on interface and port PHP

socket.php

<?php
$interface = '0.0.0.0';
$port = 9000;
$sock = socket_create(AF_INET,SOCK_STREAM,0);

socket_bind($sock, $interface, $port) or die();
socket_listen($sock);

$client = socket_accept($sock);
echo "connection established: $client";

socket_close($client);
socket_close($sock);