Added a fallback Twig extension when PHP's intl is not available

app/config/config.yml

@@ -8,6 +8,7 @@ imports:
     - { resource: parameters.yml }
     - { resource: security.yml }
     - { resource: services.yml }
+    - { resource: services.php }
 
 # These are the configuration parameters that define the application's behavior
 # and which are independent from the underlying technical infrastructure

app/config/services.php

@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * This file loads services into the Symfony Container dynamically. This allows
+ * to check if the PHP Intl extension is loaded in the system. If it's loaded,
+ * we use the default Twig Intl extension. If it's not loaded, we use a fallback
+ * Twig extension which doesn't require the Intl extension.
+ */
+
+use Symfony\Component\DependencyInjection\Definition;
+
+$serviceClass = extension_loaded('intl') ? 'Twig_Extensions_Extension_Intl' : 'AppBundle\\Twig\\IntlExtension';
+
+$definition = new Definition($serviceClass);
+$definition->setPublic(false);
+$definition->addTag('twig.extension');
+$container->setDefinition('app.twig.intl_extension', $definition);

app/config/services.yml

@@ -16,12 +16,6 @@ services:
         tags:
             - { name: twig.extension }
 
-    app.twig.intl_extension:
-        public: false
-        class:  Twig_Extensions_Extension_Intl
-        tags:
-            - { name: twig.extension }
-
     app.redirect_to_preferred_locale_listener:
         class: AppBundle\EventListener\RedirectToPreferredLocaleListener
         arguments: ['@router', '%app_locales%', '%locale%']

src/AppBundle/Twig/IntlExtension.php

@@ -0,0 +1,74 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace AppBundle\Twig;
+
+/**
+ * This Twig extension adds a new 'localizeddate' filter to format date/time
+ * objects. These formats are for English language only because this extension
+ * is exclusively used when the system doesn't have the PHP Intl extension loaded.
+ *
+ * @author Javier Eguiluz <[email protected]>
+ */
+class IntlExtension extends \Twig_Extension
+{
+    private $dateFormats = array(
+        'full' => 'l, F d, Y',
+        'long' => 'F d, Y',
+        'medium' => 'M d, Y',
+        'short' => 'M/d/yy',
+        'none' => '',
+    );
+
+    private $timeFormats = array(
+        'full' => 'r',
+        'long' => 'h:i:s a e',
+        'medium' => 'h:i:s a',
+        'short' => 'h:i a',
+        'none' => '',
+    );
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFilters()
+    {
+        return array(
+            new \Twig_SimpleFilter('localizeddate', array($this, 'getLocalizedDate')),
+        );
+    }
+
+    /**
+     * Formats the given date string/object according to some predefined
+     * date/time formats.
+     *
+     * @param  mixed $date
+     * @param  string $dateFormat
+     * @param  string $timeFormat
+     *
+     * @return string
+     */
+    public function getLocalizedDate($date, $dateFormat = 'medium', $timeFormat = 'medium')
+    {
+        $date = ($date instanceof \DateTimeInterface) ? $date : new \DateTime($date);
+
+        return $date->format($this->dateFormats[$dateFormat].' '.$this->timeFormats[$timeFormat]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        // the name of the Twig extension must be unique in the application
+        return 'app.intl_extension';
+    }
+}