按子数组分组

Question

我有以下数组：

 $tickets[] = array( 'event_id', 'ticket_name','holder_name', 'order_id', 'ticket_id', 'security_code')

我希望能够按'event_id'对输出进行分组并获取：

Event_ID 1 
         -> Ticket ID 1 ......
         -> Ticket ID 2 .....
Event_ID 2
         -> Ticket ID 3......

到目前为止我已经知道了：

 foreach ($tickets as $key =>  $event ) {
        $tickets[$key]['event_id'] = $event;

这看起来是否正确？

由于

编辑：综合解决方案1。

`

<?php
    do_action( 'tribe_tickets_ticket_email_top' );
    $groupedEvents = array();               
foreach($tickets as $key => $ticket)
{
    $groupedEvents['Event_ID_'.$ticket['event_id']][] = $ticket['ticket_id'];

    if ( function_exists( 'tribe_get_venue_id' ) ) {
            $event      = get_post( $groupedEvents['Event_ID'] );
            $venue_id = tribe_get_venue_id( $event->ID );
            if ( ! empty( $venue_id ) ) {
            $venue = get_post( $venue_id );
            }
            $venue_label = tribe_get_venue_label_singular();
            $venue_name = $venue_phone = $venue_address = $venue_city = $venue_web = '';
            if ( ! empty( $venue ) ) {
                $venue_name    = $venue->post_title;
                $venue_phone   = get_post_meta( $venue_id, '_VenuePhone', true );
                $venue_address = get_post_meta( $venue_id, '_VenueAddress', true );
                $venue_city    = get_post_meta( $venue_id, '_VenueCity', true );
                $venue_web     = get_post_meta( $venue_id, '_VenueURL', true );
            }

        }

<?php echo $venue_name; ?>
<?php  echo $venue_address; ?>
<?php  echo $venue_city; ?>
<?php  echo $venue_phone; ?>
<a href="<?php  echo esc_url( $venue_web ) ?>" ><?php  echo $venue_web; ?></a>
}    
<?php  esc_html_e( 'Ticket #', 'event-tickets' ); ?>  <?php  echo $groupedEvents['ticket_id']; ?>          
 <?php  esc_html_e( 'Ticket Type', 'event-tickets' ); ?>            
<?php  echo $groupedEvents['ticket_name']; ?>
<?php  echo $groupedEvents['holder_name']; ?>
<?php  esc_html_e( 'Security Code', 'event-tickets' ); ?>
<?php  echo $groupedEvents['security_code']; ?>  
    ?>`