John James Jacoby 45053ef512 Mail: allow custom attachment filenames in wp_mail().
Previous to this change, attachment filenames in outgoing emails could only ever be derived from their paths (passed in as a numerically indexed array of `$attachments`).

This changeset adds support for passing an associative `$attachments` array, where the key strings will be used as filenames instead.

Includes 2 new unit tests to ensure both array formats continue to work as intended.

Props johnjamesjacoby, ritteshpatel, swissspidy, syntaxart.
Fixes #28407.

git-svn-id: https://develop.svn.wordpress.org/trunk@55030 602fd350-edb4-49c9-b593-d223f7449a82
2023-01-05 10:47:06 +00:00
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