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wp-content/plugins/webp-express/lib/migrate/migrate2.php

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+<?php
+
+namespace WebPExpress;
+
+use \WebPExpress\Messenger;
+use \WebPExpress\Option;
+use \WebPExpress\Paths;
+use \WebPExpress\TestRun;
+
+/* helper. Remove dir recursively. No warnings - fails silently
+   Set $removeTheDirItself to false if you want to empty the dir
+*/
+function webpexpress_migrate2_rrmdir($dir, $removeTheDirItself = true) {
+    if (@is_dir($dir)) {
+        $objects = @scandir($dir);
+        foreach ($objects as $object) {
+            if ($object != "." && $object != "..") {
+                $file = $dir . "/" . $object;
+                if (@is_dir($file)) {
+                    webpexpress_migrate2_rrmdir($file);
+                } else {
+                    @unlink($file);
+                }
+            }
+        }
+        if ($removeTheDirItself) {
+            @rmdir($dir);
+        }
+    }
+}
+
+$testResult = TestRun::getConverterStatus();
+if ($testResult) {
+    $workingConverters = $testResult['workingConverters'];
+    if (in_array('imagick', $workingConverters)) {
+       webpexpress_migrate2_rrmdir(Paths::getCacheDirAbs(), false);
+       Messenger::addMessage(
+           'info',
+           'WebP Express has emptied the image cache. In previous versions, the imagick converter ' .
+              'was generating images in poor quality. This has been fixed. As your system meets the ' .
+              'requirements of the imagick converter, it might be that you have been using that. So ' .
+              'to be absolutely sure you do not have inferior conversions in the cache dir, it has been emptied.'
+       );
+    }
+    if (in_array('gmagick', $workingConverters)) {
+        Messenger::addMessage(
+            'info',
+            'Good news! WebP Express is now able to use the gmagick extension for conversion - ' .
+               'and your server meets the requirements!'
+        );
+    }
+    if (in_array('cwebp', $workingConverters)) {
+        Messenger::addMessage(
+            'info',
+            'WebP Express added several options for the cwebp conversion method. ' .
+                '<a href="' . Paths::getSettingsUrl() . '">Go to the settings page to check it out</a>.'
+        );
+    }
+}
+Messenger::addMessage(
+    'info',
+    'WebP Express can now be configured to cache the webp images. You might want to ' .
+        '<a href="' . Paths::getSettingsUrl() . '">do that</a>.'
+);
+
+
+Option::updateOption('webp-express-migration-version', '2');