PHP 7.2 - 警告:count():参数必须是一个数组或一个实现 Countable 的对象 [英] PHP 7.2 - Warning: count(): Parameter must be an array or an object that implements Countable

问题描述

我刚刚将我的 PHP 安装从 5.6 升级到了 7.2.我在登录页面上使用了 count() 函数，如下所示:

I just upgraded my PHP installation from version 5.6 to 7.2. I used the count() function on my login page like so:

if (!empty($_POST['username']) && !empty($_POST['password'])):
    $records = $conn->prepare('SELECT id,username,password FROM users WHERE username = :username');
    $records->bindParam(':username', $_POST['username']);
    $records->execute();
    $results = $records->fetch(PDO::FETCH_ASSOC);

    $message = '';
    
    if (count($results) > 0 && password_verify($_POST['password'], $results['password'])) {
        $_SESSION['user_id'] = $results['id'];
        header("Location: /");
    } else {
        $message = 'Sorry, those credentials do not match';
    }
endif;

搜索后，找到了类似的问题和答案，但都与WordPress有关，我找不到纯PHP的解决方案.

After searching, I found questions and answers similar to this one, but they all were related to WordPress, and I couldn’t find a solution for Pure PHP.

推荐答案

PDO fetch 在失败时返回 false.所以你也需要检查这个案例:

PDO fetch returns false on failure. So you need to check this case too:

if ($results && count($results) > 0 && password_verify($_POST['password'], $results['password'])) {
    $_SESSION['user_id'] = $results['id'];
    header("Location: /");
} else {
    $message = 'Sorry, those credentials do not match';
}

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