PHP Multidimensional array within nested foreach loop -

working on wordpress metabox-plugin , trying save metadata multidimensional array (in text explode later on).

this code:

function wordpress_metabox() {   $event_adress = explode('|', get_post_meta($post->id, '_event_adress', true));  foreach ($event_id $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[$key].'" />   </div><!-- end .ticket -->   <input type="button" class="button" id="add_ticket" value="+ add ticket" />  </div><!-- end .event -->  <input type="button" class="button" id="add_event" value="+ add event" />';   }  }  //this save function function wordpress_metabox_save($post_id, $post) {   // user allowed edit post or page?  if ( !current_user_can( 'edit_post', $post->id ))      return $post->id;   // ok, we're authenticated: need find , save data  // we'll put array make easier loop though.   $event_meta['_event_adress'] = $_post['_event_adress'];  $event_meta['_event_id'] = $_post['_event_id'];   // add values of $event_meta custom fields  foreach ($event_meta $key => $value) { // cycle through $event_meta array!      if( $post->post_type == 'revision' ) return; // don't store custom data twice      $value = implode('|', (array)$value); // if $value array, separate |       if(get_post_meta($post->id, $key, false)) { // if custom field has value          update_post_meta($post->id, $key, $value);      } else { // if custom field doesn't have value         add_post_meta($post->id, $key, $value);      }      if(!$value) delete_post_meta($post->id, $key); // delete if blank  } } 

the should foreach-loop haven't gotten far yet that's why wrote same div twice illustrate. can please answer how can save each ticket adress , price in multidimensional array? i'm not sure if it's possible type e.g. _event_adress[][] store each data within nested array? or have type first key in?