implement port open check

src/Port.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Net;
+
+class Port
+{
+    public static function isHost(mixed $value): bool
+    {
+        return
+        (
+            is_string($value) &&
+            (
+                false !== filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ||
+                false !== filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ||
+                false !== filter_var($value, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)
+            )
+        );
+    }
+
+    public static function isPort(mixed $value): bool
+    {
+        $length = strlen(
+            $value
+        );
+
+        return false !== filter_var($value, FILTER_VALIDATE_INT) && 0 < $length && 65536 > $length;
+    }
+
+    public static function isOpen(string $host, int $port = -1, ?float $timeout = null, int &$error_code = null, string &$error_message = null): bool
+    {
+        return is_resource(
+            @fsockopen(
+                $host,
+                $port,
+                $error_code,
+                $error_message,
+                $timeout
+            )
+        );
+    }
+}