内爆数组的键[重复]

Question

我正在尝试将 $users_in_range 数组中的用户 ID 内爆，问题是它是内爆英里而不是用户 ID

<?PHP
$users_in_range = users_in_range($lat, $long, 500, true); 

// implode users into mysql friendly list
$comma_separated = implode(",", $users_in_range);
echo $comma_separated;

// this is just for output while debugging
foreach ($users_in_range as $userid => $miles_away) {
    echo "UserID=<b>$userid</b> is <b>$miles_away</b> miles away from me.<br />";
}
?>

Answer 1

userid 是数组的键，所以你需要这样做：

$comma_separated = implode(",", array_keys($users_in_range));

Answer 2

尝试：

$comma_separated = implode(',', array_keys($users_in_range));