php imploding数组帮助

Question

我试图破坏$ users_in_range数组中的userIDs问题是它是iploding里程而不是用户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，因此您需要执行以下操作：

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

Answer 2

尝试：

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