PHP. Руководство по PHP. 2005
variant_cast

variant_cast
Description
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().

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Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.
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