Removing duplicate brightcove ID's

removing-duplicates.php

$playlist = array(
  [0] => WP Post Object
       [ID] => 1;
       [_brightcove_id] = 1
  [1] => WP Post Object
       [ID] => 2;
       [_brightcove_id] = 2
  [2] => WP Post Object
       [ID] => 3;
       [_brightcove_id] = 1
);

//If duplicate _brightcove_id, remove latter array key (eg. [2])

<?php
$playlist = array_filter(
    $posts,
    function ( $post ) {
        static $seen = array();
        if ( array_key_exists( $post->_brightcove_id, $seen ) ) {
            return false;
        }
        $seen[$post->_brightcove_id] = true;
        return true;
    }
);