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Omeka_Filter_ForeignKey
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.. php:class:: Omeka_Filter_ForeignKey

    Package: :doc:`Filter </Reference/packages/Filter/index>`

    Converts input into values suitable for use as Omeka 'id' key values.

    .. php:method:: filter(mixed $value)
    
        Convert any value into an unsigned integer that would be valid
        if stored as a foreign key in a database table.
        
        This will return null for any value that falls outside the rangeof an unsigned integer (string, negative numbers, etc.)
        
        :param mixed $value: Input value.
        :returns: integer