ArrayIterator incompatible method current() php 7.4

[jeroenkosse]

Preconditions (*)

1. Version 2.4.1 and previous releases with support for php 7.4
2. Environment should use php >= 7.4

Steps to reproduce (*)

1. Invoke the \Magento\Catalog\Block\Product\ListProduct::initializeProductCollection function on a product page with a product with categories
2. Following line will be executed: $this->setCategoryId(current($categories->getIterator())->getId());

Expected result (*)

1. I expect the id from the first category from the product

Actual result (*)

1. Error is returned because you call getId() on null.
2. From php >= 7.4 the current() method is no longer returning the first item from a ArrayIterator and instead returns null
3. More informations about this incompatible change can be found on phpdoc ( https://www.php.net/manual/en/migration74.incompatible.php#migration74.incompatible.spl )

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @jeroenkosse. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Steps to reproduce
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[mamsincl]

confirmed using 2.4.2 with php7.4

switching back to php7.3 temporarily solved the issue

[magento-engcom-team]

@engcom-Oscar Thank you for verifying the issue.

Unfortunately, not enough information was provided to acknowledge ticket. Please consider adding the following:

• Add "Reproduced on " label(s) to this ticket based on verification result

Once all required information is added, please add label "Issue: Confirmed" again.
Thanks!