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c438bebad1
The method attempted to check if there is already a file with the same name, however the conditional used an undefined variable. This commit prevents directory creation if a file or directory with the same name already exists, bringing consistency with the PHP `mkdir()` implementation. Includes adding missing documentation for the method. Reference: [https://www.php.net/manual/en/streamwrapper.mkdir.php PHP Manual: streamWrapper::mkdir()]. Follow-up to [49230]. Props david.binda, sadizaman, rajinsharwar, SergeyBiryukov. Fixes #59406. git-svn-id: https://develop.svn.wordpress.org/trunk@56998 602fd350-edb4-49c9-b593-d223f7449a82