diff --git a/bin/export-plural-rules b/bin/export-plural-rules
index 0389e2e..102d44b 100755
--- a/bin/export-plural-rules
+++ b/bin/export-plural-rules
@@ -56,10 +56,11 @@ class Enviro
 
     /**
      * Omit extra parenthesis in plural rule formulas.
+     * If null: formulas will be exported with and without extra parenthesis (if supported by the exporter).
      *
-     * @var bool
+     * @var bool|null
      */
-    public static $noExtraParenthesis;
+    public static $extraParenthesis;
 
     /**
      * Parse the command line options.
@@ -72,7 +73,7 @@ class Enviro
         self::$outputFilename = null;
         self::$languages = null;
         self::$reduce = null;
-        self::$noExtraParenthesis = false;
+        self::$extraParenthesis = true;
         $exporters = Exporter::getExporters();
         if (isset($argv) && is_array($argv)) {
             foreach ($argv as $argi => $arg) {
@@ -96,10 +97,13 @@ class Enviro
                             self::$reduce = false;
                             break;
                         case '--parenthesis=yes':
-                            self::$noExtraParenthesis = false;
+                            self::$extraParenthesis = true;
                             break;
                         case '--parenthesis=no':
-                            self::$noExtraParenthesis = true;
+                            self::$extraParenthesis = false;
+                            break;
+                        case '--parenthesis=both':
+                            self::$extraParenthesis = null;
                             break;
                         default:
                             if (preg_match('/^--output=.+$/', $argLC)) {
@@ -185,6 +189,8 @@ Where:
         plural rules formulas.
         Those extra parenthesis are needed to create a PHP-compatible
         formula.
+        Some exporter may also export formulas both with and without
+        The extra parenthesis: use --parenthesis=both in this case
         Defaults to 'yes'
     --output
         if specified, the output will be saved to <file name>. If not
@@ -265,7 +271,7 @@ try {
     if (Enviro::$reduce) {
         $languages = Enviro::reduce($languages);
     }
-    if (Enviro::$noExtraParenthesis) {
+    if (Enviro::$extraParenthesis === false) {
         $languages = array_map(
             function (Language $language) {
                 $language->formula = $language->buildFormula(true);
@@ -275,10 +281,18 @@ try {
             $languages
         );
     }
+    $exporterClass = Exporter::getExporterClassName(Enviro::$outputFormat);
+    $options = array(
+        'us-ascii' => Enviro::$outputUSAscii,
+        'both-formulas' => Enviro::$extraParenthesis === null,
+    );
+    if ($options['both-formulas'] && !call_user_func(array($exporterClass, 'supportsFormulasWithAndWithoutParenthesis'))) {
+        throw new Exception("The selected exporter doesn't support exporting data with and without extra paranthesis");
+    }
     if (isset(Enviro::$outputFilename)) {
-        echo call_user_func(array(Exporter::getExporterClassName(Enviro::$outputFormat), 'toFile'), $languages, Enviro::$outputFilename, array('us-ascii' => Enviro::$outputUSAscii));
+        echo call_user_func(array($exporterClass, 'toFile'), $languages, Enviro::$outputFilename, $options);
     } else {
-        echo call_user_func(array(Exporter::getExporterClassName(Enviro::$outputFormat), 'toString'), $languages, array('us-ascii' => Enviro::$outputUSAscii));
+        echo call_user_func(array($exporterClass, 'toString'), $languages, $options);
     }
 } catch (Exception $x) {
     fwrite(STDERR, $x->getMessage() . "\n");
diff --git a/src/Exporter/Exporter.php b/src/Exporter/Exporter.php
index 95a7112..eb249ba 100644
--- a/src/Exporter/Exporter.php
+++ b/src/Exporter/Exporter.php
@@ -90,17 +90,18 @@ final public static function getExporterClassName($exporterHandle)
      */
     final public static function toString($languages, $options = null)
     {
-        if (isset($options) && is_array($options)) {
-            if (isset($options['us-ascii']) && $options['us-ascii']) {
-                $asciiList = array();
-                foreach ($languages as $language) {
-                    $asciiList[] = $language->getUSAsciiClone();
-                }
-                $languages = $asciiList;
+        if (!isset($options) || !is_array($options)) {
+            $options = array();
+        }
+        if (isset($options['us-ascii']) && $options['us-ascii']) {
+            $asciiList = array();
+            foreach ($languages as $language) {
+                $asciiList[] = $language->getUSAsciiClone();
             }
+            $languages = $asciiList;
         }
 
-        return static::toStringDo($languages);
+        return static::toStringDoWithOptions($languages, $options);
     }
 
     /**
@@ -129,6 +130,16 @@ public static function isForPublicUse()
         return true;
     }
 
+    /**
+     * Does this exporter supports exporting formulas both with and without extra parenthesis?
+     *
+     * @return bool
+     */
+    public static function supportsFormulasWithAndWithoutParenthesis()
+    {
+        return false;
+    }
+
     /**
      * Return a short description of the exporter.
      *
@@ -143,11 +154,15 @@ public static function getDescription()
      * Convert a list of Language instances to string.
      *
      * @param \Gettext\Languages\Language[] $languages the Language instances to convert
+     * @param array $options export options
      *
      * @return string
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
+        if (method_exists(get_called_class(), 'toStringDo')) {
+            return static::toStringDo($languages);
+        }
         throw new Exception(get_called_class() . ' does not implement the method ' . __FUNCTION__);
     }
 }
diff --git a/src/Exporter/Html.php b/src/Exporter/Html.php
index d16e782..5e9b90b 100644
--- a/src/Exporter/Html.php
+++ b/src/Exporter/Html.php
@@ -17,53 +17,47 @@ public static function getDescription()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
-        return self::buildTable($languages, false);
-    }
-
-    protected static function h($str)
-    {
-        return htmlspecialchars($str, ENT_COMPAT, 'UTF-8');
-    }
-
-    protected static function buildTable($languages, $forDocs)
-    {
-        $prefix = $forDocs ? '            ' : '';
         $lines = array();
-        $lines[] = $prefix . '<table' . ($forDocs ? ' class="table table-bordered table-condensed table-striped"' : '') . '>';
-        $lines[] = $prefix . '    <thead>';
-        $lines[] = $prefix . '        <tr>';
-        $lines[] = $prefix . '            <th>Language code</th>';
-        $lines[] = $prefix . '            <th>Language name</th>';
-        $lines[] = $prefix . '            <th># plurals</th>';
-        $lines[] = $prefix . '            <th>Formula</th>';
-        $lines[] = $prefix . '            <th>Plurals</th>';
-        $lines[] = $prefix . '        </tr>';
-        $lines[] = $prefix . '    </thead>';
-        $lines[] = $prefix . '    <tbody>';
+        $lines[] = '<table>';
+        $lines[] = '    <thead>';
+        $lines[] = '        <tr>';
+        $lines[] = '            <th>Language code</th>';
+        $lines[] = '            <th>Language name</th>';
+        $lines[] = '            <th># plurals</th>';
+        $lines[] = '            <th>Formula</th>';
+        $lines[] = '            <th>Plurals</th>';
+        $lines[] = '        </tr>';
+        $lines[] = '    </thead>';
+        $lines[] = '    <tbody>';
         foreach ($languages as $lc) {
-            $lines[] = $prefix . '        <tr>';
-            $lines[] = $prefix . '            <td>' . $lc->id . '</td>';
+            $lines[] = '        <tr>';
+            $lines[] = '            <td>' . $lc->id . '</td>';
             $name = self::h($lc->name);
             if (isset($lc->supersededBy)) {
                 $name .= '<br /><small><span>Superseded by</span> ' . $lc->supersededBy . '</small>';
             }
-            $lines[] = $prefix . '            <td>' . $name . '</td>';
-            $lines[] = $prefix . '            <td>' . count($lc->categories) . '</td>';
-            $lines[] = $prefix . '            <td>' . self::h($lc->formula) . '</td>';
+            $lines[] = '            <td>' . $name . '</td>';
+            $lines[] = '            <td>' . count($lc->categories) . '</td>';
+            $lines[] = '            <td>' . self::h($lc->formula) . '</td>';
             $cases = array();
             foreach ($lc->categories as $c) {
                 $cases[] = '<li><span>' . $c->id . '</span><code>' . self::h($c->examples) . '</code></li>';
             }
-            $lines[] = $prefix . '            <td><ol' . ($forDocs ? ' class="cases"' : '') . ' start="0">' . implode('', $cases) . '</ol></td>';
-            $lines[] = $prefix . '        </tr>';
+            $lines[] = '            <td><ol start="0">' . implode('', $cases) . '</ol></td>';
+            $lines[] = '        </tr>';
         }
-        $lines[] = $prefix . '    </tbody>';
-        $lines[] = $prefix . '</table>';
+        $lines[] = '    </tbody>';
+        $lines[] = '</table>';
 
         return implode("\n", $lines);
     }
+
+    protected static function h($str)
+    {
+        return htmlspecialchars($str, ENT_COMPAT, 'UTF-8');
+    }
 }
diff --git a/src/Exporter/Json.php b/src/Exporter/Json.php
index 8ea57b8..a78ea11 100644
--- a/src/Exporter/Json.php
+++ b/src/Exporter/Json.php
@@ -14,6 +14,16 @@ public static function getDescription()
         return 'Build a compressed JSON-encoded file';
     }
 
+    /**
+     * {@inheritdoc}
+     *
+     * @see \Gettext\Languages\Exporter\Exporter::supportsFormulasWithAndWithoutParenthesis()
+     */
+    public static function supportsFormulasWithAndWithoutParenthesis()
+    {
+        return true;
+    }
+
     /**
      * Return the options for json_encode.
      *
@@ -35,9 +45,9 @@ protected static function getEncodeOptions()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
         $list = array();
         foreach ($languages as $language) {
@@ -55,7 +65,14 @@ protected static function toStringDo($languages)
             if (isset($language->baseLanguage)) {
                 $item['baseLanguage'] = $language->baseLanguage;
             }
-            $item['formula'] = $language->formula;
+            if (!empty($options['both-formulas'])) {
+                $item['formulas'] = array(
+                    'standard' => $language->buildFormula(true),
+                    'php' => $language->formula,
+                );
+            } else {
+                $item['formula'] = $language->formula;
+            }
             $item['plurals'] = count($language->categories);
             $item['cases'] = array();
             $item['examples'] = array();
diff --git a/src/Exporter/Php.php b/src/Exporter/Php.php
index d6b8d1b..d3cf7fe 100644
--- a/src/Exporter/Php.php
+++ b/src/Exporter/Php.php
@@ -17,9 +17,9 @@ public static function getDescription()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
         $lines = array();
         $lines[] = '<?php';
diff --git a/src/Exporter/Po.php b/src/Exporter/Po.php
index 797f4b9..45ee61a 100644
--- a/src/Exporter/Po.php
+++ b/src/Exporter/Po.php
@@ -19,9 +19,9 @@ public static function getDescription()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
         if (count($languages) !== 1) {
             throw new Exception('The ' . get_called_class() . ' exporter can only export one language');
diff --git a/src/Exporter/Ruby.php b/src/Exporter/Ruby.php
index ff08a3e..16fc64d 100644
--- a/src/Exporter/Ruby.php
+++ b/src/Exporter/Ruby.php
@@ -17,9 +17,9 @@ public static function getDescription()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
         $lines = array();
         $lines[] = 'PLURAL_RULES = {';
diff --git a/src/Exporter/Xml.php b/src/Exporter/Xml.php
index 32358b8..0fd410a 100644
--- a/src/Exporter/Xml.php
+++ b/src/Exporter/Xml.php
@@ -17,9 +17,9 @@ public static function getDescription()
     /**
      * {@inheritdoc}
      *
-     * @see \Gettext\Languages\Exporter\Exporter::toStringDo()
+     * @see \Gettext\Languages\Exporter\Exporter::toStringDoWithOptions()
      */
-    protected static function toStringDo($languages)
+    protected static function toStringDoWithOptions($languages, array $options)
     {
         $xml = new \DOMDocument('1.0', 'UTF-8');
         $xml->loadXML('<languages