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The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

MB_OVERLOAD_MAIL (integer)

MB_OVERLOAD_STRING (integer)

MB_OVERLOAD_REGEX (integer)

MB_CASE_UPPER (integer)

MB_CASE_LOWER (integer)

MB_CASE_TITLE (integer)