Issue #3461309 by charlliequadros, annmarysruthy, sivaji_ganesh_jojodae,...

      '#type' => 'textfield',

    ];

    // Get button configurations, filter out NULL values.

    $args = array_filter([$first, $second, $third]);

    // Define button types for each argument.

    $button_types = [

      's' => 'submit',

      'i' => 'image_button',

      'b' => 'button',

    ];

    // Loop through each path argument, adding buttons based on the information

    // in the argument. For example, if the path is

    // form-test/clicked-button/s/i/rb, then 3 buttons are added: a 'submit', an

    // 'image_button', and a 'button' with #access=FALSE. This enables form.test

    // to test a variety of combinations.

    $i = 0;

    $args = [$first, $second, $third];

    foreach ($args as $arg) {

      $name = 'button' . ++$i;

      // 's', 'b', or 'i' in the argument define the button type wanted.

      if (!is_string($arg)) {

        $type = NULL;

      }

      elseif (str_contains($arg, 's')) {

        $type = 'submit';

      }

      elseif (str_contains($arg, 'b')) {

        $type = 'button';

      }

      elseif (str_contains($arg, 'i')) {

        $type = 'image_button';

      }

      else {

        $type = NULL;

      }

      if (isset($type)) {

    foreach ($args as $index => $arg) {

      // Get the button type based on the index of the argument.

      $type = $button_types[$arg] ?? NULL;

      $name = 'button' . ($index + 1);

      if ($type) {

        // Define the button.

        $form[$name] = [

          '#type' => $type,

          '#name' => $name,