get_player_stats Function Update

// Player Stats
function get_apps_data( $playerID ) {
    $apps = 0;  // Total appearances.
    $subs = 0;  // Total sub-appearances.
    $goals = 0; // Total goals.

    $query = new WP_Query( array( 'post_type' => 'match' ) );
    $posts = $query->posts;

    foreach($posts as $post) {
        for ( $n = 1; $n <= 18; $n++ ) {
            // Check if the player is $playerID
            $pl = get_post_meta( $post->ID, 'pl' . $n, true );
            if ( $playerID == $pl ) {
                $apps++;

                // Check his sub-out appearance.
                $so = get_post_meta( $post->ID, 'so' . $n, true );
                $subs += $so ? 1 : 0;

                // Check his sub-in appearance.
                $si = get_post_meta( $post->ID, 'si' . $n, true );
                $subs += $si ? 1 : 0;
            }

            // Check if he scored goal {$n}-th.
            $s = get_post_meta( $post->ID, 's' . $n, true );
            if ( $playerID == $s ) {
                $goals++;
            }
        }
    }
    wp_reset_query();

    return compact( 'apps', 'subs', 'goals' );
}