fix: support array with hreflang

Author: kenjis

system/Helpers/html_helper.php

@@ -265,7 +265,7 @@ function link_tag(
 
         $link .= 'rel="' . $rel . '" ';
 
-        if ($type !== '' && $rel !== 'canonical') {
+        if ($type !== '' && $rel !== 'canonical' && $hreflang === '') {
             $link .= 'type="' . $type . '" ';
         }
 

tests/system/Helpers/HTMLHelperTest.php

@@ -367,6 +367,18 @@ public function testLinkTagArray()
         $this->assertSame($expected, link_tag($parms));
     }
 
+    public function testLinkTagArrayHreflang()
+    {
+        $tag = link_tag([
+            'href'     => 'https://example.com/en',
+            'rel'      => 'alternate',
+            'hreflang' => 'x-default',
+        ]);
+
+        $expected = '<link href="https://example.com/en" hreflang="x-default" rel="alternate" />';
+        $this->assertSame($expected, $tag);
+    }
+
     public function testDocType()
     {
         $target   = 'html4-strict';