Drupal 9.4.10 is not compatible with PHP 7.4

Line 25 of core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php does not contain a | character.

@liquidcms, could be a patch causing this.
check core/PATCHES.txt for anything mentioning layout builder.

Same problem (Installation of 9.4.10) with PHP 7.4.30 during update.php on th "verfying requirements page": Update stops with "7.4.30
Your PHP installation is too old. Drupal requires at least PHP 8.0. It is recommended to upgrade to PHP version 8.0 or higher for the best ongoing support. "

2 separate issues here..

1. Core (status report and drush warnings) as well as the PHP System Requirements page definitely have been messed up with a misunderstanding of "required" vs "recommended".

I think, although hard to tell from all the contradicting info, that the Requirements page is still correct (D9 requires PHP 7+, D10 requires PHP 8+). The status report and drush messages are false.

2. as @joseph.olstad suggested, it is most likely my code error reported above is due to inadvertently updating a patch to a newer version (which is only for D10 and therefore adding PHP 8 code).

As people start to migrate from PHP 7 as well as from D9 to D10, i can certainly see the confusion core is adding with the incorrect/inconsistent messaging. Consider the situations:
- patches apply to D9 code but have PHP 8 code in them
- D9 core is compatible with PHP 7 but contrib modules stating D9 compatibility may have PHP code in them (have come across a couple already)
- many D9 contrib modules i suspect are not compatible with PHP 8.

@liquidcms, thanks for illuminating this, yes it definately looks like the verifying requirements page. For us using D9.4.10 we've been using PHP 8.0 in production for a while no issues. Just starting to look into PHP 8.1 as contrib seems to be almost ready.

For D7.94 I've got PHP 8.2 running nicely on a fairly complex site (and it's fast!), very pleased so far.

There definitely is a months- or years-old issue about the 7.4 supported version warning being confusing. If anyone can find that one it would be great.

There have been no updates—I’m assuming this isn’t an extant issue. If I’m assuming wrong, reopen it with more information.