Fixes #11212: Added headers to PO file in `yii\i18n\GettextPoFile::save()`

framework/CHANGELOG.md

@@ -55,6 +55,7 @@ Yii Framework 2 Change Log
 - Bug #11528: Fixed MessageFormatter construction exception caught for PHP 7 compatibility (subdee, cebe)
 
 - Bug #11878: Fixed i18n gettext fallback language message loading (stevekr)
+- Enh #11212: Added headers to PO file in `yii\i18n\GettextPoFile::save()` (stevekr)
 
 2.0.8 April 28, 2016
 --------------------

framework/i18n/GettextPoFile.php

@@ -54,7 +54,21 @@ class GettextPoFile extends GettextFile
      */
     public function save($filePath, $messages)
     {
-        $content = '';
+        $language = str_replace('-', '_', basename(dirname($filePath)));
+        $headers = [
+            'msgid ""',
+            'msgstr ""',
+            '"Project-Id-Version: \n"',
+            '"POT-Creation-Date: \n"',
+            '"PO-Revision-Date: \n"',
+            '"Last-Translator: \n"',
+            '"Language-Team: \n"',
+            '"Language: ' . $language . '\n"',
+            '"MIME-Version: 1.0\n"',
+            '"Content-Type: text/plain; charset=' . Yii::$app->charset . '\n"',
+            '"Content-Transfer-Encoding: 8bit\n"'
+        ];
+        $content = implode("\n", $headers) . "\n\n";
         foreach ($messages as $id => $message) {
             $separatorPosition = strpos($id, chr(4));
             if ($separatorPosition !== false) {

tests/framework/i18n/GettextPoFileTest.php

@@ -10,6 +10,13 @@ use yiiunit\TestCase;
  */
 class GettextPoFileTest extends TestCase
 {
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->mockApplication();
+    }
+
     public function testLoad()
     {
         $poFile = new GettextPoFile();