如何使用PHP实现商城的设备指标统计功能

function countDeviceType($deviceType) {
    // $deviceType为设备型号，如iPhone、华为等等
    $Mysqli = new mysqli("localhost", "username", "passWord", "database");
    if ($mysqli -> connect_errno) {
        echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
        exit();
    }

    $sql = "SELECT count(*) AS count FROM device_info WHERE device_type LIKE '%" . $deviceType . "%'";
    if ($result = $mysqli -> query($sql)) {
        $row = $result -> fetch_assoc();
        echo "设备型号 " . $deviceType . " 的访问数量为：" . $row['count'] . "<br>";
    } else {
        echo "查询失败";
    }

    $mysqli -> close();
}

function countDeviceTypePercentage() {
    $deviceTypes = ["iPhone", "华为", "小米", "vivo", "OPPO"]; // 这里列出了常见的一些手机品牌，可以根据实际情况进行修改

    $total = 0;
    $data = [];

    $mysqli = new mysqli("localhost", "username", "password", "database");
    if ($mysqli -> connect_errno) {
        echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
        exit();
    }

    foreach ($deviceTypes as $deviceType) {
        $sql = "SELECT count(*) AS count FROM device_info WHERE device_type LIKE '%" . $deviceType . "%'";
        if ($result = $mysqli -> query($sql)) {
            $row = $result -> fetch_assoc();
            $total += $row['count'];
            $data[$deviceType] = $row['count'];
        } else {
            echo "查询失败";
        }
    }

    foreach ($data as $key => $value) {
        echo $key . " 占比为：" . number_fORMat($value / $total * 100, 2) . "%<br>";
    }

    $mysqli -> close();
}