[wp-trac] [WordPress Trac] #60241: Revert usage of str_contains() in older bundled themes

[WordPress Trac]

#60241: Revert usage of str_contains() in older bundled themes
----------------------------+--------------------
 Reporter:  SergeyBiryukov  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  6.5
Component:  Bundled Theme   |    Version:
 Severity:  normal          |   Keywords:
  Focuses:                  |
----------------------------+--------------------
 Background: #58206.

 In [55988], instances of `false !== strpos( ... )` were replaced with
 `str_contains()` in core files, including the Twenty Twenty and Twenty
 Seventeen bundled themes.

 As [comment:67:ticket:58206 pointed out] by @poena, the polyfill for
 `str_contains()` is only available in WordPress 5.9 or later, while Twenty
 Twenty supports WordPress 4.7 and PHP 5.2.4, where the use of
 `str_contains()` causes fatal errors. This applies to Twenty Seventeen
 too.

 Full list of changes that should be reverted: [55988/trunk/src/wp-
 content/themes].

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Ticket URL: <https://core.trac.wordpress.org/ticket/60241>
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