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8616ad913a
This addresses a discrepancy where using `unlink()` allows for checking if it was successful via the return value, but `wp_delete_file()` did not have a return value, making it impossible to verify the result without doing overhead checks if the file still exists. This also brings more consistency with the other `wp_delete_*()` functions, specifically: * `wp_delete_file_from_directory()` * `wp_delete_post()` * `wp_delete_post_revision()` * `wp_delete_attachment()` * `wp_delete_attachment_files()` * `wp_delete_comment()` * `wp_delete_nav_menu()` * `wp_delete_term()` * `wp_delete_site()` * `wp_delete_user()` Includes adding basic unit tests for `wp_delete_file()`. Follow-up to [31575]. Props bedas, debarghyabanerjee, mukesh27, SergeyBiryukov. Fixes #61590. git-svn-id: https://develop.svn.wordpress.org/trunk@58715 602fd350-edb4-49c9-b593-d223f7449a82