PHP 기능을 사용하여 사용자 등록 및 로그인에 대한 비밀번호 강도를 감지하고 향상시키는 방법은 무엇입니까?

function checkPasswordStrength($password) {
    $strength = 0;
  
    // 检测密码长度
    $length = strlen($password);
    if ($length >= 8) {
        $strength += 1;
    }

    // 检测是否包含字母、数字和特殊字符
    if (preg_match('/[a-zA-Z]/', $password) && 
        preg_match('/d/', $password) &&
        preg_match('/[^a-zA-Z0-9]/', $password)) {
        $strength += 1;
    }

    return $strength;
}

$password = "Abc123!";
$strength = checkPasswordStrength($password);
echo "密码强度为：".$strength;

密码强度为：2

function generateRandomPassword($length) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_-=+";
    $password = "";
    for ($i = 0; $i < $length; $i++) {
        $password .= $chars[rand(0, strlen($chars) - 1)];
    }
    return $password;
}

$newPassword = generateRandomPassword(8);
echo "随机生成的密码为：".$newPassword;

随机生成的密码为：x1Q9bK@7

function generateSalt() {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $salt = "";
    for ($i = 0; $i < 10; $i++) {
        $salt .= $chars[rand(0, strlen($chars) - 1)];
    }
    return $salt;
}

// 假设用户输入的密码为123456
$password = "123456";
$salt = generateSalt();
$hashedPassword = sha1($password.$salt);
echo "存储的密码（加盐后）为：".$hashedPassword;