[wp-trac] [WordPress Trac] #54005: Get warning error of "Undefined array key 0" after upgrading to PHP 8.0.9

[WordPress Trac]

#54005: Get warning error of "Undefined array key 0" after upgrading to PHP 8.0.9
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 Reporter:  moazzamgodil            |       Owner:  (none)
     Type:  defect (bug)            |      Status:  new
 Priority:  normal                  |   Milestone:  Awaiting Review
Component:  Plugins                 |     Version:  5.8
 Severity:  critical                |  Resolution:
 Keywords:  php8 reporter-feedback  |     Focuses:
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Comment (by moazzamgodil):

 Replying to [comment:3 Hareesh Pillai]:
 > Thanks for the confirmation.
 > How are you calling admin_notice? In your theme's functions file? Can
 you share the code?

 My issue has been resolved after I replaced **add_action** with
 **do_action**. Before the update, the admin_notice with add_action was
 working fine. Anyways thanks a lot.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54005#comment:5>
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