Question

我有一个从数据库中获取日志的功能，但是每当我试图回显此信息时，都可以。我只有第一项。

        function getCoins($odb) {
        $website = new website();
        $SQLGetCoinsLog = $odb -> query("SELECT * FROM `user_logs` ORDER BY `id` DESC");
        while ($getInfo = $SQLGetCoinsLog -> fetch(PDO::FETCH_ASSOC)) {
            $id = $getInfo['id'];
            $userid = $getInfo['userid'];
            $nazwa = $getInfo['nazwa'];
            $cena = $getInfo['cena'];
            $transid = $getInfo['transid'];
            $data = $website->converTimestamp($getInfo['data']);
            $result = '
                <tr class="text-center">
                    <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td>
                    <td>'.$nazwa.'</td>
                    <td>'.$cena.'PLN</td>
                    <td>'.$transid.'</td>
                    <td>'.$data.'</td>
                </tr>                                           
            ';
        }
        return $result;
        }

Answer 1

添加

$result = "";

在函数顶部定义它（在while循环之前），然后更改

$result = ' <tr class="text-center"> <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td> <td>'.$nazwa.'</td> <td>'.$cena.'PLN</td> <td>'.$transid.'</td> <td>'.$data.'</td> </tr> ';

收件人

$result .= ' <tr class="text-center"> <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td> <td>'.$nazwa.'</td> <td>'.$cena.'PLN</td> <td>'.$transid.'</td> <td>'.$data.'</td> </tr> ';

请注意，等号旁边的点将添加到您的变量中，而不会覆盖您的变量。

Answer 2

您有一些选择。
在循环中回显它们（不会“返回”它们），这样实际上并不能回答您的问题，但是由于它是您构建的表，因此在某些时候我认为必须将其回显。

   function getCoins($odb) {
    $website = new website();
    $SQLGetCoinsLog = $odb -> query("SELECT * FROM `user_logs` ORDER BY `id` DESC");
    while ($getInfo = $SQLGetCoinsLog -> fetch(PDO::FETCH_ASSOC)) {
        $id = $getInfo['id'];
        $userid = $getInfo['userid'];
        $nazwa = $getInfo['nazwa'];
        $cena = $getInfo['cena'];
        $transid = $getInfo['transid'];
        $data = $website->converTimestamp($getInfo['data']);
        echo'
            <tr class="text-center">
                <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td>
                <td>'.$nazwa.'</td>
                <td>'.$cena.'PLN</td>
                <td>'.$transid.'</td>
                <td>'.$data.'</td>
            </tr>                                           
        ';
    }
    }

或者您可以使用结果构建一个数组：

   function getCoins($odb) {
    $website = new website();
    $SQLGetCoinsLog = $odb -> query("SELECT * FROM `user_logs` ORDER BY `id` DESC");
    while ($getInfo = $SQLGetCoinsLog -> fetch(PDO::FETCH_ASSOC)) {
        $id = $getInfo['id'];
        $userid = $getInfo['userid'];
        $nazwa = $getInfo['nazwa'];
        $cena = $getInfo['cena'];
        $transid = $getInfo['transid'];
        $data = $website->converTimestamp($getInfo['data']);
        $result[] = '
            <tr class="text-center">
                <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td>
                <td>'.$nazwa.'</td>
                <td>'.$cena.'PLN</td>
                <td>'.$transid.'</td>
                <td>'.$data.'</td>
            </tr>                                           
        ';
    }
    return $result;
    }

//To echo them in main program:
Echo implode("\n", getCoins($odb));

或者您可以使用所有结果构建一个字符串：

    function getCoins($odb) {
    $website = new website();
    $SQLGetCoinsLog = $odb -> query("SELECT * FROM `user_logs` ORDER BY `id` DESC");
    $result = "";
    while ($getInfo = $SQLGetCoinsLog -> fetch(PDO::FETCH_ASSOC)) {
        $id = $getInfo['id'];
        $userid = $getInfo['userid'];
        $nazwa = $getInfo['nazwa'];
        $cena = $getInfo['cena'];
        $transid = $getInfo['transid'];
        $data = $website->converTimestamp($getInfo['data']);
        $result .= '
            <tr class="text-center">
                <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td>
                <td>'.$nazwa.'</td>
                <td>'.$cena.'PLN</td>
                <td>'.$transid.'</td>
                <td>'.$data.'</td>
            </tr>                                           
        ';
    }
    return $result;
    }

Answer 3

您为数据库行的结果提供的这些变量无用，或者您无法受益，因为它们都是local variables，或者在重复循环后将它们删除并重新创建，因为您是在循环中创建的，应该在循环外创建它们，（例如）我认为您只需要结果，所以我只在循环外添加结果：-

function getCoins($odb) {
    $website = new website();
    $SQLGetCoinsLog = $odb -> query("SELECT * FROM `user_logs` ORDER BY `id` DESC");
    $result = array();
    while ($getInfo = $SQLGetCoinsLog -> fetch(PDO::FETCH_ASSOC)) {
        $id = $getInfo['id'];
        $userid = $getInfo['userid'];
        $nazwa = $getInfo['nazwa'];
        $cena = $getInfo['cena'];
        $transid = $getInfo['transid'];
        $data = $website->converTimestamp($getInfo['data']);
        array_push($result, '
            <tr class="text-center">
                <td><a href="https://steamcommunity.com/profiles/'.$userid.'" target="_blank">'.$userid.'</a></td>
                <td>'.$nazwa.'</td>
                <td>'.$cena.'PLN</td>
                <td>'.$transid.'</td>
                <td>'.$data.'</td>
            </tr>                                           
        ');
    }
    return $result;
    }

如何在while循环中返回所有元素？

3 个答案: