祝你学习好运。

$fivesdrafts = $wpdb->get_results( 
    "
    SELECT ID, post_title 
    FROM $wpdb->posts
    WHERE post_status = \'draft\' 
        AND post_author = 5
    "
);

foreach ( $fivesdrafts as $fivesdraft ) 
{
    echo $fivesdraft->post_title;
}

在你的情况下

$wpdb->get_results(

$variable_to_print = $wpdb->get_results(

这就是成功的原因：

function find_highest_bid(){
    global $wpdb;
    $postid = get_the_id();
    $table = $wpdb->prefix . "jwp_bids";
    $highest_bid = $wpdb->get_results(
        "Select max(bid_amt) AS bid, bid_time, email
        FROM $table
        WHERE post_id = \'1277\'", ARRAY_A );
    $highest_bid = array_shift ( $highest_bid );
    $high_bid = $highest_bid[\'bid\'];
    $high_bidder = $highest_bid[\'email\'];
    $bid_time = $highest_bid[\'bid_time\'];
    echo \'$\'. $high_bid;
    echo ", ";
    echo $high_bidder;
    echo ", ";
    echo $bid_time;
}