Initial data commit

Task/Echo-server/PHP/echo-server.php

@@ -0,0 +1,31 @@
+$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
+socket_bind($socket, '127.0.0.1', 12321);
+socket_listen($socket);
+
+$client_count = 0;
+while (true){
+  if (($client = socket_accept($socket)) === false) continue;
+  $client_count++;
+
+  $client_name = 'Unknown';
+  socket_getpeername($client, $client_name);
+  echo "Client {$client_count} ({$client_name}) connected\n";
+  $pid = pcntl_fork();
+  if($pid == -1) die('Could not fork');
+  if($pid){
+    pcntl_waitpid(-1, $status, WNOHANG);
+    continue;
+  }
+
+  //In a child process
+  while(true){
+    if($input = socket_read($client, 1024)){
+      socket_write($client, $input);
+    } else {
+      socket_shutdown($client);
+      socket_close($client);
+      echo "Client {$client_count} ({$client_name}) disconnected\n";
+      exit();
+    }
+  }
+}