Php 计算一些行

我有一个问题，我想创建一个计算数据库数据的函数。但我希望从列中计算一些ID，而不是所有行

我的代码不起作用：

function countMember() {
    include("./config/config.php");
    $fetch_countMember =   $fetch_countMember->prepare("SELECT * FROM `accounts`");
    $fetch_countMember->execute();
    while($fetch_countMember=   $fetch_countMember->fetch()) {
    if($fetch_countMember["member"] == 5 || $fetch_countMember["member"] == 6 || $fetch_countMember["member"] == 12 || $fetch_countMember["member"] == 13 || $fetch_countMember["member"] == 14 || $fetch_countMember["member"] == 15 || $fetch_countMember["member"] == 16 || $fetch_countMember["member"] == 17 || $fetch_countMember["member"] == 20 || $fetch_countMember["member"] == 21)
        $c_member++;
    }
    return $c_member;
}

你需要使用

优雅的方式：

$pdo = new PDO(....);
$ids = [5,6,12,13,14,15,16,17,20,21];
$query = sprintf("SELECT * FROM accounts WHERE member IN (%s)", implode($ids, ','));
$count = $pdo->exec();
echo $count;

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你有错误吗？对于计数部分，最好将查询更改为：SELECT*FROM

accounts

WHERE member IN（…）