[wp-trac] [WordPress Trac] #56709: Encountered a problem that no one has ever met Please help me

[WordPress Trac]

#56709: Encountered a problem that no one has ever met Please help me
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 Reporter:  qq2094629698       |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Formatting         |     Version:
 Severity:  normal             |  Resolution:
 Keywords:  dev-feedback php8  |     Focuses:
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Changes (by jrf):

 * keywords:  dev-feedback => dev-feedback php8


Comment:

 Thanks for looping me in @davidbaumwald.

 I have seen numerous similar issues, including with the
 `convert_smilies()` function, and they are 100% of the time caused by an
 incorrect call to this function, so this needs a backtrace to figure out
 where this is coming from.

 > Tracing this in the 6.0 branch, this seems to point to
 https://core.trac.wordpress.org/browser/branches/6.0/src/wp-
 includes/formatting.php#L3415 which does implement count on a variable
 that could indeed be false.

 The thing is, it will actually be pretty hard to get this error, even when
 passing invalid input.
 The `preg_split()` doesn't easily return `false`. AFAIK, this will only
 happen when the regex is faulty (which it isn't) and would then be
 accompanied by a warning about the error in the regex, see:
 https://3v4l.org/N3t8W

 @qq2094629698 Aside from the backtrace, could you please also mention in
 your reply:
 * The version of WordPress you are using (to confirm we're actually
 looking at the right call to `count()`.
 * The version of PHP your site is running on.
 * Test whether you can still reproduce the error with a WP native theme
 and all plugins turned off ?

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Ticket URL: <https://core.trac.wordpress.org/ticket/56709#comment:2>
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