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wp-content/plugins/webp-express/lib/classes/PluginUninstall.php

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+<?php
+
+namespace WebPExpress;
+
+use \WebPExpress\FileHelper;
+use \WebPExpress\Option;
+use \WebPExpress\Paths;
+
+/**
+ *
+ */
+
+class PluginUninstall
+{
+    // The hook was registred in AdminInit
+    public static function uninstall() {
+
+        $optionsToDelete = [
+            'webp-express-messages-pending',
+            'webp-express-action-pending',
+            'webp-express-state',
+            'webp-express-version',
+            'webp-express-activation-error',
+            'webp-express-migration-version'
+        ];
+        foreach ($optionsToDelete as $i => $optionName) {
+            Option::deleteOption($optionName);
+        }
+
+        // remove content dir (config plus images plus htaccess-tests)
+        FileHelper::rrmdir(Paths::getWebPExpressContentDirAbs());
+    }
+}