Symfony version(s) affected

5.4.30

Description

symfony/http-foundation@2213955

Create many warnings on php 7.2 and not identical work on php 7.2\8.1

• Uninitialized string offset: 0
  /HeaderUtils.php(266)

• $separators on 7.2 possible false

How to reproduce

run on php 7.2-7.4

Possible Solution

privatestaticfunction groupParts(array$matches,string$separators,bool$first =true):array    {$separator =$separators[0];$separators =substr($separators,1) ?:'';

Additional Context

No response