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Convert a variant into a new variant object of another type (PHP 5)
variant variant_cast ( variant variant, int type )

This function makes a copy of variant and then performs a variant cast operation to force the copy to have the type given by type. type should be one of the VT_XXX constants.

This function wraps VariantChangeType() in the COM library; consult MSDN for more information.

See also variant_set_type().