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[FrankenPHP+DebugBundle+WebProfilerBundle] Using dd in worker mode results in blank page #61340

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[FrankenPHP+DebugBundle+WebProfilerBundle] Using dd in worker mode results in blank page#61340
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BugStatus: Needs Review
@ruudk

Description

@ruudk
ruudk
opened on Aug 5, 2025

Symfony version(s) affected

7.3.2

Description

I'm using Symfony Framework with DebugBundle and WebProfilerBundle enabled and notice something odd.

When I use dd('test'); inside a controller, using PHP FPM, I would see an empty page with the test visible.

But when I switch to FrankenPHP, it no longer works. I get an empty page instead.

When I use dump('test'); I see the dump visible in the Symfony Toolbar.

When I comment out the follow code, dd works as expected:

symfony/src/Symfony/Bundle/DebugBundle/DebugBundle.php

Lines 30 to 48 in 7b2d29f

// This code is here to lazy load the dump stack. This default
// configuration is overridden in CLI mode on 'console.command' event.
// The dump data collector is used by default, so dump output is sent to
// the WDT. In a CLI context, if dump is used too soon, the data collector
// will buffer it, and release it at the end of the script.
VarDumper::setHandler(function ($var, ?string $label = null) use ($container) {
$dumper = $container->get('data_collector.dump');
$cloner = $container->get('var_dumper.cloner');
$handler = function ($var, ?string $label = null) use ($dumper, $cloner) {
$var = $cloner->cloneVar($var);
if (null !== $label) {
$var = $var->withContext(['label' => $label]);
}
$dumper->dump($var);
};
VarDumper::setHandler($handler);
$handler($var, $label);
});

When I disable worker mode, it just works as expected.

How to reproduce

Possible Solution

Could it be related to the fact that the above code works on boot, and maybe together with worker mode this is only called once?

Additional Context

https://frankenphp.dev/docs/worker/

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