Redis + Sentinel + PHP8

[Nuranto]

Preconditions and environment

• Magento version 2.4.4
• PHP8.1

Redis + Sentinel for session & cache

Steps to reproduce

Launch a command or page that use session or cache

Expected result

Everything's working fine

Actual result

Exception #0 (Exception): Deprecated Functionality: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /var/www/html/vendor/colinmollenhour/php-redis-session-abstract/src/Cm/RedisSession/Handler.php on line 300

Additional information

I reported the issue here : colinmollenhour/php-redis-session-abstract#47

When it will be solved, the magento's composer version requirement for this package should be updated.

Release note

No response

Triage and priority

• 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 @Nuranto. Thank you for your report.
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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
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[engcom-November]

Hi @Nuranto ,
Thank you for reporting. Verified the issue on Magento 2.4.4 version with PHP 8.1.6 and redis configured but could not able to reproduce the issue.


Kindly elaborate steps / missing configuration details to reproduce the issue.
Thank you.

[Nuranto]

Your sentinel_master and sentinel_servers are empty. To reproduce, you need to fill them

[engcom-November]

Verified the issue again on Magento 2.4-develop branch by filling sentinel_master and sentinel_servers values and the issue is reproducible.
Exception in var/log/system.log file: main.ERROR: Deprecated Functionality: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /var/www/html/magento2/vendor/colinmollenhour/php-redis-session-abstract/src/Cm/RedisSession/Handler.php on line 300 [] []

Unable to access UI anymore. Hence confirming this issue.