Settings page arrays

Hi,

I am having trouble getting the required array from the settings page. My markup is this:

<div id="tab-two">
                            <p></p>
                            <table class="sortable-meta-table">
                                <thead>
                                        <th>Slide Heading</th>
                                        <th>Slide Paragraph</th>
                                        <th>Slide Image</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <tr>
                                        <td>
                                            <input type="text" name="custom_slider[slide_heading][]" class="widefat" value="<?php echo $slideHeading ?>">
                                        </td>
                                        <td>
                                            <textarea name="custom_slider[slide_paragraph][]" class="widefat" rows="4"><?php echo $slideParagraph ?></textarea>
                                        </td>
                                        <td>
                                            <div class="image-meta-container">
                                                <img src="<?php echo $slideImageUrl ?>" class="meta-image-preview" style="max-width: 250px">
                                                <input class="meta-image-value hidden" type="url" name="custom_slider[slide_image_url][]" value="<?php echo $slideImageUrl ?>">
                                                <input type="button" class="button meta-image-button" value="Upload Image">
                                                <input type="button" class="button delete-custom-img" value="Delete Image">
                                            </div>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td>
                                            <input type="text" name="custom_slider[slide_heading][]" class="widefat" value="<?php echo $slideHeading ?>">
                                        </td>
                                        <td>
                                            <textarea name="custom_slider[slide_paragraph][]" class="widefat" rows="4"><?php echo $slideParagraph ?></textarea>
                                        </td>
                                        <td>
                                            <div class="image-meta-container">
                                                <img src="<?php echo $slideImageUrl ?>" class="meta-image-preview" style="max-width: 250px">
                                                <input class="meta-image-value hidden" type="url" name="custom_slider[slide_image_url][]" value="<?php echo $slideImageUrl ?>">
                                                <input type="button" class="button meta-image-button" value="Upload Image">
                                                <input type="button" class="button delete-custom-img" value="Delete Image">
                                            </div>
                                        </td>
                                    </tr>

                                </tbody>
                            </table>

When the options are save the output in SQL is this:

array (
  'slide_heading' =>
  array (
    0 => '5h245gq34feqw',
    1 => 'b4vqrewcqevrbtb5',
  ),
  'slide_paragraph' =>
  array (
    0 => 'fwy5324bq3rwveca',
    1 => '4b4werqwevdc',
  ),
  'slide_image_url' =>
  array (
    0 => 'https://wpdev:8888/wp-content/uploads/2016/05/1.png',
    1 => 'https://wpdev:8888/wp-content/uploads/2016/05/2.png',
  ),
)

Does anyone know how I can get it to be in this format? :

array (
  'slide' =>
  array (
     'slide_heading' => '5h245gq34feqw',
     'slide_paragraph' => 'b4vqrewcqevrbtb5',
     'slide_image_url' => 'b4vqrewcqevrbtb5',
  ),
  'slide' =>
  array (
     'slide_heading' => '5h245gq34feqw',
     'slide_paragraph' => 'b4vqrewcqevrbtb5',
     'slide_image_url' => 'b4vqrewcqevrbtb5',
  ),

etc...
)

Many Thanks
Nick