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update incompatibilities section #2420

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15 changes: 8 additions & 7 deletions docs/known-issues.md
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Expand Up @@ -9,18 +9,19 @@ description: Reference of FrankenPHP limitations, including unsupported PHP exte

The following extensions are known not to be compatible with FrankenPHP:

| Name | Reason | Alternatives |
| ----------------------------------------------------------------------------------------------------------- | --------------- | -------------------------------------------------------------------------------------------------------------------- |
| [imap](https://www.php.net/manual/imap.installation.php) | Not thread-safe | [javanile/php-imap2](https://github.com/javanile/php-imap2), [webklex/php-imap](https://github.com/Webklex/php-imap) |
| [newrelic](https://docs.newrelic.com/docs/apm/agents/php-agent/getting-started/introduction-new-relic-php/) | Not thread-safe | - |
| Name | Reason | Alternatives |
| ----------------------------------------------------------------------------------------------------------- | --------------- |---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [imap](https://www.php.net/manual/imap.installation.php) | Not thread-safe | [javanile/php-imap2](https://github.com/javanile/php-imap2), [webklex/php-imap](https://github.com/Webklex/php-imap), [ImapEngine](https://github.com/DirectoryTree/ImapEngine) |
| [newrelic](https://docs.newrelic.com/docs/apm/agents/php-agent/getting-started/introduction-new-relic-php/) | Not thread-safe | - |

## Buggy PHP extensions
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@henderkes henderkes May 16, 2026

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## Buggy PHP extensions
## PHP extensions with limited support


The following extensions have known bugs and unexpected behaviors when used with FrankenPHP:
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@henderkes henderkes May 16, 2026

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The following extensions have known bugs and unexpected behaviors when used with FrankenPHP:
The following extensions are in beta or have known issues when used with FrankenPHP:


| Name | Problem |
| ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [ext-openssl](https://www.php.net/manual/book.openssl.php) | When using musl libc, the OpenSSL extension may crash under heavy loads. The problem doesn't occur when using the more popular GNU libc. This bug is [being tracked by PHP](https://github.com/php/php-src/issues/13648). |
| Name | Problem |
|---------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| [datadog](https://github.com/DataDog) | Experiences instability when profiling FrankenPHP. This bug is [being tracked by DataDog](https://github.com/DataDog/dd-trace-php/issues/3729). |
| [blackfire](https://blackfire.io/) | [FrankenPHP support is in beta and not yet feature-complete](https://docs.blackfire.io/php/integrations/frankenphp). |
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@dunglas dunglas May 15, 2026

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To me it shouldn't be marked as "buggy". It works perfectly well in normal mode.

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@henderkes henderkes May 15, 2026

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both of them? I've seen crashes for both not too recently

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@dunglas dunglas May 15, 2026

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Blackfire. But if they both crash, then let's keep them.

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@henderkes henderkes May 16, 2026

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Blackfire is using datadog for continuous profiling (ZTS) under the hood, so it might be related to that. Perhaps we can rename the header from "buggy" to something else, but I'm not sure to what.


## get_browser

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