PHP Multidimensional array within nested foreach loop

Question

Working on a wordpress metabox-plugin and trying to save metadata as a multidimensional array (in text that i explode later on).

This is my code:

function wordpress_metabox() {

 $event_adress = explode('|', get_post_meta($post->ID, '_event_adress', true));
 foreach ($event_id as $key => $id){

  echo '<div class="event">
  <div class="ticket">
  <input type="text" name="_event_adress[]" value="'.$event_adress[$key].'" />
   <input type="text" name="_event_price[]" value="'.$event_price[$key].'" />
  </div><!-- end .ticket -->
  <div class="ticket">
   <input type="text" name="_event_adress[]" value="'.$event_adress[$key].'" />
   <input type="text" name="_event_price[]" value="'.$event_price[$key].'" />
  </div><!-- end .ticket -->
  <input type="button" class="button" id="add_ticket" value="+ Add ticket" />
 </div><!-- end .event -->
 <input type="button" class="button" id="add_event" value="+ Add Event" />';

 }

}

//this is the save function
function wordpress_metabox_save($post_id, $post) {

 // Is the user allowed to edit the post or page?
 if ( !current_user_can( 'edit_post', $post->ID ))
     return $post->ID;

 // OK, we're authenticated: we need to find and save the data
 // We'll put it into an array to make it easier to loop though.

 $event_meta['_event_adress'] = $_POST['_event_adress'];
 $event_meta['_event_id'] = $_POST['_event_id'];

 // Add values of $event_meta as custom fields
 foreach ($event_meta as $key => $value) { // Cycle through the $event_meta array!
     if( $post->post_type == 'revision' ) return; // Don't store custom data twice
     $value = implode('|', (array)$value); // If $value is an array, separate with |

     if(get_post_meta($post->ID, $key, FALSE)) { // If the custom field already has a value
         update_post_meta($post->ID, $key, $value);
     } else { // If the custom field doesn't have a value
        add_post_meta($post->ID, $key, $value);
     }
     if(!$value) delete_post_meta($post->ID, $key); // Delete if blank
 }
}

The should actually be a foreach-loop but i haven't gotten that far yet that's why i wrote the same div twice to illustrate. Can someone please answer how i can save each ticket adress and price in a multidimensional array? I'm not sure if it's possible to type e.g. _event_adress[][] to store each data within a nested array? Or do i have to type the first key in?