[wp-trac] [WordPress Trac] #61680: is_utf8_charset() undefined when called by code in compat.php

[WordPress Trac]

#61680: is_utf8_charset() undefined when called by code in compat.php
--------------------------+-------------------------
 Reporter:  dmsnell       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  high          |  Milestone:  6.6.1
Component:  General       |    Version:  6.6
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
--------------------------+-------------------------
 #61182 introduced `is_utf8_charset()` as a way of standardizing checks for
 charset slugs referring to UTF-8. This is called by `_mb_strlen()` inside
 of `compat.php`, but `is_utf8_charset()` is defined in `functions.php`,
 which isn't loaded early on.

 Code calling `mb_strlen()` early on before `functions.php` loads in hosts
 without the multibyte extension therefore may crash. This was reported in
 `wp-super-cache` [https://github.com/Automattic/jetpack/issues/38358
 jetpack report].

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Ticket URL: <https://core.trac.wordpress.org/ticket/61680>
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