remove www from display url

src/url.php

@@ -2,8 +2,8 @@
 namespace p3k\url;
 
 function display_url($url) {
-  # remove scheme
-  $url = preg_replace('/^https?:\/\//', '', $url);
+  # remove scheme and www.
+  $url = preg_replace('/^https?:\/\/(www\.)?/', '', $url);
   # if the remaining string has no path components but has a trailing slash, remove the trailing slash
   $url = preg_replace('/^([^\/]+)\/$/', '$1', $url);
   return $url;

tests/URLTest.php

@@ -12,6 +12,12 @@ class URLTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals('example.com/foo', $url);
     $url = p3k\url\display_url('http://example.com/foo/');
     $this->assertEquals('example.com/foo/', $url);
+    $url = p3k\url\display_url('http://www.example.com/foo/');
+    $this->assertEquals('example.com/foo/', $url);
+    $url = p3k\url\display_url('https://www.example.com/foo/');
+    $this->assertEquals('example.com/foo/', $url);
+    $url = p3k\url\display_url('https://example.www.example.com/foo/');
+    $this->assertEquals('example.www.example.com/foo/', $url);
   }
 
   public function testAddQueryParamsToURLNoExistingParams() {