`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.
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The current coding standards note that the name of the class files should be based on the class name with `class-` prepended, and the underscores replaced by hyphens (see the [https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/#naming-conventions Naming Conventions] section in the handbook), except for the three legacy files: `class.wp-dependencies.php`, `class.wp-scripts.php`, `class.wp-styles.php`.
To bring more consistency to the codebase and make it easier to implement autoloading in the future, this commit renames those three legacy files to conform to the coding standards:
* `wp-includes/class.wp-dependencies.php` → `wp-includes/class-wp-dependencies.php`
* `wp-includes/class.wp-scripts.php` → `wp-includes/class-wp-scripts.php`
* `wp-includes/class.wp-styles.php` → `wp-includes/class-wp-styles.php`
Includes:
* Loading the new files from the old ones, for anyone that may have been including the files directly.
* Replacing references to the old filenames with the new filenames.
Follow-up to [7970], [45654], [45662], [45663], [45678], [47197], [52026], [53749].
Props afragen, schlessera, swissspidy, dingo_d, hellofromTonya, SergeyBiryukov.
Fixes#37861. See #55647.
Built from https://develop.svn.wordpress.org/trunk@54254
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