My-metabox-car

<?php

add_action('save_post', 'my_metabox_save');
add_action( 'add_meta_boxes', 'my_metabox' );

function my_metabox () {

add_meta_box('my_metabox_id', "my test metabox", 'my_metabox_cb', 'portfolio', 'normal', 'high');

}


//Metabox callback function
function my_metabox_cb () {

wp_nonce_field( plugin_basename(__FILE__), 'myplugin_noncename' );
$my_favorite_car = get_post_meta($_GET['post'], 'my-best-car', true);

?>

<div class="my-metabox-field">
<h2>my-car-type</h2>

 <?php

$cars = array('car1', 'car2', 'car3', 'car4', 'car5', 'car6');

foreach ($cars as $car) {
    echo  '<input name="my-best-car" type="radio"  onchange="javascript:document.post.submit()"';
    $option = 'id=" ' .$car . '"';
    $option = 'value="' . $car . '"';

    if ($category == $my_favorite_car) $option .= 'checked="checked"';
    $option .= '>';
    $option .= '<label for=" '.$car .' ">' . $car .'  ';
    $option .=  '</label>';
    echo $option;

  }

 ?>

<?php

if ($my_favorite_car == "car1") :

?>
<div class="car1-info-box>
<h2>car1 info </h2>


///my content for car 1 information


<div>
<?php

endif;

endif;

?>

<?php

if ($my_favorite_car == "car2") :

?>

//my if else statement for all cars type car3, car4 shortened here. visibility of each div is toggle in front end using jQuery. So selection on each car in radio option make respective div visible for me.

////////////////////////////////////////////////////////////////////////////////////////////////////////

<?php

}

function my_metabox_save ($post_id) {

 if ( !wp_verify_nonce( $_POST['myplugin_noncename'], plugin_basename(__FILE__) )) {
    return $post_id;
  }

  if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
    return $post_id;

  if ( 'page' == $_POST['post_type'] ) {
    if ( !current_user_can( 'edit_page', $post_id ) )
      return $post_id;
  } else {
    if ( !current_user_can( 'edit_post', $post_id ) )
      return $post_id;
  }

  update_post_meta($post_id, 'my-best-car', $_POST['my-best-car'], true);


}

?>