def int_shape(x):
    """Returns the shape of tensor or variable as a tuple of int or None entries.

    # Arguments
        x: Tensor or variable.

    # Returns
        A tuple of integers (or None entries).

    # Examples
    ```python
        >>> from keras import backend as K
        >>> inputs = K.placeholder(shape=(2, 4, 5))
        >>> K.int_shape(inputs)
        (2, 4, 5)
        >>> val = np.array([[1, 2], [3, 4]])
        >>> kvar = K.variable(value=val)
        >>> K.int_shape(kvar)
        (2, 2)
    ```
    """
    if hasattr(x, '_keras_shape'):
        return x._keras_shape
    try:
        return tuple(x.get_shape().as_list())
    except ValueError:
        return None
