php - 如何从数组更新表？

Question

$query = "SELECT users FROM tabl ORDER BY RAND()";
$result = mysql_query ($query)
    or die ("Query '$query' failed with error message: \"" . mysql_error () . '"');

while ($row = mysql_fetch_array($result)) {
    $users[] = $row[0];
}

$current = end($users);
$partners = array();
foreach ($users as $user)
{
        $partners[$user] = $current;
        $current = $user;
}
print_r($partners);

$query2 = "UPDATE tabl SET partner = {$partners[0]} WHERE users = '$users'";
mysql_query ($query2)
    or die ("<br>Query '$query2' failed with error message: \"" . mysql_error () . '"');

这就是我正在使用的代码。在 query2 之前一切都很好。我已经尝试了所有我能想到的变体，但没有任何效果。

该表有两个字段:用户和合作伙伴。该代码以随机顺序拉出用户，然后将他们分配给彼此，形成一个圆圈。我需要用任务填充合作伙伴字段。

Answer 1

将更新查询放在 foreach 循环中，然后您就可以使用合作伙伴和用户变量，而无需稍后深入数组:

foreach ($users as $user)
{
        $partners[$user] = $current;
        $current = $user;
        $query2 = "UPDATE tabl SET partner = '{$partners[$user]}' WHERE users = '{$user}'";
        mysql_query ($query2)
          or die ("<br>Query '$query2' failed with error message: \"" . mysql_error ()
}