Checking specific connections

Sometimes, you need to check if two specific posts (or users) are connected. Here's how you can do that:

<?php
$p2p_id = p2p_type( 'YOUR_CONNECTION_TYPE' )->get_p2p_id( $post_a, $post_b );

if ( $p2p_id ) {
  // connection exists
  $connection_field = p2p_get_meta( $p2p_id, 'YOUR_FIELD_KEY', true );
  var_dump( $connection_field );
} else {
  // connection doesn't exist
}

$post_a and $post_b are post (or user) objects.