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This avoids "A non-numeric value encountered" warning when `mbstring.func_overload` is set to something other than a numeric string, e.g. an empty string instead of the default `'0'` value. Props djbu. Fixes #53282. git-svn-id: https://develop.svn.wordpress.org/trunk@51032 602fd350-edb4-49c9-b593-d223f7449a82