Question

数据没有插入到数据库中，因为它没有传递if语句。我目前正在制作一个表格，将民意调查和相应的答案插入数据库。显然，if语句中的变量是不可数对象（例如$answers，$rows。如何使这些变量可数，我是否必须使它们成为数组？或者我必须完全改变它if-statements？这些陈述是错误的：
if (count($answers) <= 1)
if (count($rows) == 0)
foreach($answers as $answer)

这是我的代码：

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
    // get form data and escape it properly
    $poll = strip_tags($_POST["poll"]);
    $rawAnswers = strip_tags($_POST["answers"]);

    //
    $formattedAnswers = str_replace(", ", ",", $rawAnswers);
    $answers = explode(",", $formattedAnswers);

    // add answers to database
    include("opendb.php");

    if (count($answers) <= 1) {
        echo "<p>It makes no sense to add less than or equal to one answer.</p>";
    } else {
        // add poll to database if it is not already there
        $pollNewCheck = $db->prepare('SELECT * FROM polls WHERE poll = ?');
        $pollNewCheck->bindValue(1, $poll, PDO::PARAM_STR);
        $pollNewCheck->execute();
        $rows = $pollNewCheck->fetch();
        if (count($rows) == 0) {
            $pollQuery = $db->prepare('INSERT INTO polls (poll) VALUES ( ? )');
            $pollQuery->bindValue(1, $poll, PDO::PARAM_STR);
            $pollQuery->execute();
            echo "<h2>Poll added!</h2><p id=\"addedPoll\">$poll</p>";
        } else {
            echo "<h2>Existing poll!</h2><p id=\"addedPoll\">\"$poll\" is already in the database. The answers you entered have been added to it.</p>";
        }

        // get poll_id for added poll
        $pollIDQuery = $db->prepare('SELECT * FROM polls WHERE poll = ?');
        $pollIDQuery->bindValue(1, $poll, PDO::PARAM_STR);
        $pollIDQuery->execute();
        $row = $pollIDQuery->fetch();
        $pollID = $row[0];

        echo "<h3>These are the available answers you added:</h3>";
        echo "<ul>";
        foreach($answers as $answer) {
            $answerQuery = $db->prepare('INSERT INTO answers (answer, poll_id) VALUES ( ?, ? )');
            $answerQuery->bindValue(1, $answer, PDO::PARAM_STR);
            $answerQuery->bindValue(2, $pollID, PDO::PARAM_STR);
            $answerQuery->execute();
            echo "<li>$answer</li>";
        }
        echo "</ul>";
        echo "<p id=\"returnToPanel\"><a href=\"/admin.php\">Return to admin panel</a></p>";
    }
}

Answer 1

当您提供更多信息时，我会在此答案中添加更多内容。

这将解决您的问题：

print_r($_POST);

假设$ _POST [“answers”]包含“aaaa，bbbbb，cccc”，那么爆炸将起作用。由于您没有提供样本输入，因此无法确切知道。

$rawAnswers = strip_tags($_POST["answers"]);  // Don't know what is in here
$formattedAnswers = str_replace(", ", ",", $rawAnswers);
$answers = explode(",", $formattedAnswers);

如果没有找到数据，PDOStatement :: fetch返回null或false。因此，这样做：

    $row = $pollNewCheck->fetch();
    if ( empty($row) ) {
        // poll was not found in the database
    } else {
        // poll was found in the database
    }

将prepare移出循环。

    $answerQuery = $db->prepare('INSERT INTO answers (answer, poll_id) VALUES ( ?, ? )');
    foreach($answers as $answer) {
        $answerQuery->bindValue(1, $answer, PDO::PARAM_STR);
        $answerQuery->bindValue(2, $pollID, PDO::PARAM_STR);
        $answerQuery->execute();
        echo "<li>$answer</li>";
    }

如何使对象可数以使if语句正常工作

1 个答案: