`str_contains()` was introduced in PHP 8.0 to perform a case-sensitive check indicating if the string to search in (haystack) contains the given substring (needle). WordPress core includes a polyfill for `str_contains()` on PHP < 8.0 as of WordPress 5.9. This commit replaces `false !== strpos( ... )` with `str_contains()` in core files, making the code more readable and consistent, as well as better aligned with modern development practices. Follow-up to [55988], [55990], [56014], [56021], [56031], [56032], [56065], [56241]. See #58206. Built from https://develop.svn.wordpress.org/trunk@56245 git-svn-id: http://core.svn.wordpress.org/trunk@55757 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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