Passing array of tag names for strip_tags() in WP Mail

[dkarfa]

In PHP 7.4 now strip_tags() also accepts an array of allowed tags: instead of strip_tags($str, '<a><p>') you can now write strip_tags($str, ['a', 'p']).

[skithund]

WordPress supports PHP 5.6+, so there's no need for PHP 7.4 only code refactoring.

[SergeyBiryukov]

Thanks for the patch!

As noted in comment:2, WordPress still supports PHP 5.6+, so the patch cannot be used until the minimum required version is bumped to PHP 7.4.