Merge pull request #3804 from Ragazzo/fileinfo_added_to_requirements_checks

fileinfo check

framework/UPGRADE.md

@@ -47,3 +47,6 @@ Upgrade from Yii 2.0 Beta
 
 * The database table of the `yii\log\DbTarget` now needs a `prefix` column to store context information.
   You can add it with `ALTER TABLE log ADD COLUMN prefix TEXT AFTER log_time;`.
+
+* The  `fileinfo`  PHP extension is now required by Yii. If you use  `yii\helpers\FileHelper::getMimeType()`, make sure 
+  you have enabled this extension. This extension is [builtin](http://www.php.net/manual/en/fileinfo.installation.php) in php above `5.3`.

framework/helpers/BaseFileHelper.php

@@ -120,16 +120,16 @@ class BaseFileHelper
      */
     public static function getMimeType($file, $magicFile = null, $checkExtension = true)
     {
-        if (function_exists('finfo_open')) {
         $info = finfo_open(FILEINFO_MIME_TYPE, $magicFile);
+
         if ($info) {
             $result = finfo_file($info, $file);
             finfo_close($info);
+
             if ($result !== false) {
                 return $result;
             }
         }
-        }
 
         return $checkExtension ? static::getMimeTypeByExtension($file) : null;
     }

framework/requirements/requirements.php

@@ -47,4 +47,11 @@ return array(
         in <code>Yii::t()</code>, <abbr title="Internationalized domain names">IDN</abbr>-feature of
         <code>EmailValidator</code> or <code>UrlValidator</code> or the <code>yii\i18n\Formatter</code> class.'
     ),
+    array(
+        'name' => 'Fileinfo extension',
+        'mandatory' => true,
+        'condition' => extension_loaded('fileinfo'),
+        'by' => '<a href="http://www.php.net/manual/en/book.fileinfo.php">File Information</a>',
+        'memo' => 'Required for files upload to detect correct file mime-types.'
+    ),
 );