[wp-trac] [WordPress Trac] #60327: Fix: PHP 8.1 deprecated warning strpos()

[WordPress Trac]

#60327: Fix: PHP 8.1 deprecated warning strpos()
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 Reporter:  get_dave      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Syncs changes from https://github.com/WordPress/gutenberg/pull/56171 to
 Core.

 Fix for PHP warning in Layout Block Supports.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60327>
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