邪道かもしれませんが、 Production モード(APP_ENV=prod)で、 Symfony Profiler を使用したい場合だってありますよね。

composer install --dev

を実行してから、

以下の修正でデバッグツールバーを使用できるようになります。

diff --git a/app/config/eccube/bundles.php b/app/config/eccube/bundles.php
index 9f22986894..5543baeee8 100644
--- a/app/config/eccube/bundles.php
+++ b/app/config/eccube/bundles.php
@@ -21,9 +21,9 @@
     Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true],
     Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle::class => ['all' => true],
     Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
-    Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true, 'test' => true, 'install' => true],
-    Symfony\Bundle\WebServerBundle\WebServerBundle::class => ['dev' => true, 'install' => true],
-    Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true, 'install' => true],
+    Symfony\Bundle\DebugBundle\DebugBundle::class => ['all' => true],
+    Symfony\Bundle\WebServerBundle\WebServerBundle::class => ['all' => true],
+    Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['all' => true],
     DAMA\DoctrineTestBundle\DAMADoctrineTestBundle::class => ['test' => true],
     Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
     SunCat\MobileDetectBundle\MobileDetectBundle::class => ['all' => true],
diff --git a/app/config/eccube/packages/prod/web_profiler.yaml b/app/config/eccube/packages/prod/web_profiler.yaml
new file mode 100644
index 0000000000..e92166a7fd
--- /dev/null
+++ b/app/config/eccube/packages/prod/web_profiler.yaml
@@ -0,0 +1,6 @@
+web_profiler:
+    toolbar: true
+    intercept_redirects: false
+
+framework:
+    profiler: { only_exceptions: false }
diff --git a/app/config/eccube/routes/prod/web_profiler.yaml b/app/config/eccube/routes/prod/web_profiler.yaml
new file mode 100644
index 0000000000..c82beff2f6
--- /dev/null
+++ b/app/config/eccube/routes/prod/web_profiler.yaml
@@ -0,0 +1,7 @@
+web_profiler_wdt:
+    resource: '@WebProfilerBundle/Resources/config/routing/wdt.xml'
+    prefix: /_wdt
+
+web_profiler_profiler:
+    resource: '@WebProfilerBundle/Resources/config/routing/profiler.xml'
+    prefix: /_profiler

ワンライナーでやりたい方は、以下をどうぞ

curl -sS https://gist.githubusercontent.com/nanasess/ca8312478d565acc5f3563e9e50022a5/raw/9cb8bcd0616cbe5d409232f997ed0585877aa4f5/symfony-profiler-on-production.patch | git apply --no-add