Gary Pendergast f3a52234ea I18N: Introduce the Plural_Forms class.
Historically, we've evaluated the plural forms for each language using `create_function()`. This is being deprecated in PHP 7.2, so needs to be replaced.

The `Plural_Forms` class parses the `Plural-Forms` header from the PO file, and internally caches the result of all subsequent plural form tests, allowing it to match the performance of the existing code.

Props rmccue.
Fixes #41562.



git-svn-id: https://develop.svn.wordpress.org/trunk@41722 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-04 01:29:59 +00:00
..