Example

Select multiple values from a box

      'select_singlebox_1' => [ 
         'exclude' => 1,
         'label' => 'select_singlebox_1 description',
         'description' => 'field description',
         'config' => [ 
            'type' => 'select',
            'renderType' => 'selectSingleBox',
            'items' => [ 
               '0' => [ 
                  '0' => 'foo 1',
                  '1' => 1,
               ],
               '1' => [ 
                  '0' => 'foo 2',
                  '1' => 2,
               ],
               '2' => [ 
                  '0' => 'divider',
                  '1' => '--div--',
               ],
               '3' => [ 
                  '0' => 'foo 3',
                  '1' => 3,
               ],
               '4' => [ 
                  '0' => 'foo 4',
                  '1' => 4,
               ],
            ],
         ],
      ],
      // Example from extension "styleguide", table "tx_styleguide_elements_select"