new method Uri::getStandardPort() added

src/Uri.php

@@ -23,6 +23,11 @@
 use Sunrise\Uri\Component\Query;
 use Sunrise\Uri\Component\Fragment;
 
+/**
+ * Import functions
+ */
+use function getservbyname;
+
 /**
  * Uniform Resource Identifier
  *
@@ -266,6 +271,30 @@ public function getPort() : ?int
 		return $this->port;
 	}
 
+	/**
+	 * Gets standard port number associated with the URI scheme
+	 *
+	 * [!] It's not PSR-7 method.
+	 *
+	 * @return null|int
+	 */
+	public function getStandardPort() : ?int
+	{
+		$scheme = $this->getScheme();
+
+		$servicePort = getservbyname($scheme, 'tcp');
+		if (false !== $servicePort) {
+			return $servicePort;
+		}
+
+		$servicePort = getservbyname($scheme, 'udp');
+		if (false !== $servicePort) {
+			return $servicePort;
+		}
+
+		return null;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

tests/UriTest.php

@@ -94,6 +94,18 @@ public function testGetFragment()
 		$this->assertEquals('fragment', $uri->getFragment());
 	}
 
+	public function testGetStandardPort() : void
+	{
+		$uri = new Uri('http://host:3000');
+		$this->assertEquals(80, $uri->getStandardPort());
+
+		$uri = new Uri('https://host:3000');
+		$this->assertEquals(443, $uri->getStandardPort());
+
+		$uri = new Uri('ftp://host:3000');
+		$this->assertEquals(21, $uri->getStandardPort());
+	}
+
 	// Withers...
 
 	public function testWithScheme()