`str_starts_with()` was introduced in PHP 8.0 to perform a case-sensitive check indicating if the string to search in (haystack) begins with the given substring (needle).
WordPress core includes a polyfill for `str_starts_with()` on PHP < 8.0 as of WordPress 5.9.
This commit replaces `0 === strpos( ... )` with `str_starts_with()` in core files, making the code more readable and consistent, as well as improving performance.
While `strpos()` is slightly faster than the polyfill on PHP < 8.0, `str_starts_with()` is noticeably faster on PHP 8.0+, as it is optimized to avoid unnecessarily searching along the whole haystack if it does not find the needle.
Follow-up to [52039], [52040], [52326].
Props spacedmonkey, costdev, sabernhardt, mukesh27, desrosj, jorbin, TobiasBg, ayeshrajans, lgadzhev, SergeyBiryukov.
Fixes#58012.
Built from https://develop.svn.wordpress.org/trunk@55703
git-svn-id: http://core.svn.wordpress.org/trunk@55215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Adds a new 'widget_block_content' filter to the widget block and hooks
`run_shortcode`, `autoembed`, `do_blocks`, and `do_shortcode` into it by
default. This is simlar to `widget_text_content.`
Fixes#51566.
Props talldanwp.
Built from https://develop.svn.wordpress.org/trunk@51058
git-svn-id: http://core.svn.wordpress.org/trunk@50667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
