图像不要上传到基于Php的在线测验中 - Image don't upload in online Quiz based on Php

首先，如果之前提到过这个问题，我很抱歉，但我没有找到一个好的答案。我尝试使用图像进行在线测验，但上传图像无法正常工作。按下按钮提交后，问题会发布在我的数据库中，但图像不会。在我的数据库中，我有一个带有 id 列、question_id、问题、类型、图像和名称的表。

我不明白到底发生了什么...我需要你的建议/指示。

我是 php 的新手，很抱歉我的代码最终出现了大错误。

提前感谢您的帮助！

<?php
     if(isset($_POST['desc'])){
          if(!isset($_POST['iscorrect']) || $_POST['iscorrect'] == ""){
        echo "Sorry, important data to submit your question is missing. Please press back in your browser and try again and make sure you select a correct answer for the question.";
        exit();
    }
           if(!isset($_POST['type']) || $_POST['type'] == ""){
        echo "Sorry, there was an error parsing the form. Please press back in your browser and try again";
        exit();
    }
    require_once("scripts/connect_db.php");
    $question = $_POST['desc'];
    $answer1 = $_POST['answer1'];
    $answer2 = $_POST['answer2'];
    $answer3 = $_POST['answer3'];
    $answer4 = $_POST['answer4'];
    $type = $_POST['type'];
    $type = preg_replace('/[^a-z]/', "", $type);
    $isCorrect = preg_replace('/[^0-9a-z]/', "", $_POST['iscorrect']);
    $answer1 = strip_tags($answer1);
    $answer1 = mysqli_real_escape_string($connection,$answer1);
    $answer2 = strip_tags($answer2);
    $answer2 = mysqli_real_escape_string($connection,$answer2);
    $answer3 = strip_tags($answer3);
    $answer3 = mysqli_real_escape_string($connection,$answer3);
    $answer4 = strip_tags($answer4);
    $answer4 = mysqli_real_escape_string($connection,$answer4);
    $question = strip_tags($question);
    $question = mysqli_real_escape_string($connection,$question);
                    require("scripts/connect_db.php");
                    if(isset($_FILES['image'])){
                        echo $_FILES['image']['tmp_name'];
                        $image= base64_encode($image);
                            }
             if($image == TRUE){
                $result=mysqli_query($connection, "insert into questions (name,image) values ('$name','$image')") or die(mysqli_error($connection));
            }
    if($type == 'tf'){
    if((!$question) || (!$answer1) || (!$answer2) || (!$isCorrect)){
        echo "Sorry, All fields must be filled in to add a new question to the quiz. Please press back in your browser and try again.";
        exit();
        }
    }
    if($type == 'mc'){
    if((!$question) || (!$answer1) || (!$answer2) || (!$answer3) || (!$answer4) || (!$isCorrect)){
        echo "Sorry, All fields must be filled in to add a new question to the quiz. Please press back in your browser and try again.";
        exit();
        }
    }
    $sql = mysqli_query($connection,"INSERT INTO questions (question, type) VALUES ('$question', '$type')")or die(mysqli_error($connection));
        $lastId = mysqli_insert_id($connection);
        mysqli_query($connection,"UPDATE questions SET question_id='$lastId' WHERE id='$lastId' LIMIT 1")or die(mysqli_error($connection));
    //// Update answers based on which is correct //////////
    if($type == 'tf'){
        if($isCorrect == "answerswer1"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '1')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysqli_error($connection));;
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
    }
    if($isCorrect == "answerswer2"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '1')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysqli_error($connection));
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
        }   
    }
    if($type == 'mc'){
        if($isCorrect == "answerswer1"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '1')")or die (mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die (mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die (mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die (mysqli_error($connection));
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
    }
    if($isCorrect == "answerswer2"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '1')")or die (mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die(mysqli_error($connection));
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
    }
    if($isCorrect == "answerswer3"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '1')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '0')")or die(mysqli_error($connection));
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
    }
    if($isCorrect == "answerswer4"){
        $sql2 = mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer4', '1')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer1', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer2', '0')")or die(mysqli_error($connection));
        mysqli_query($connection,"INSERT INTO answers (question_id, answer, correct) VALUES ('$lastId', '$answer3', '0')")or die(mysqli_error($connection));
        $msg = 'Thanks, your question has been added';
      header('location: addQuestions.php?msg='.$msg.'');
    exit();
        }
    }
}
?>
<?php 
$msg = "";
if(isset($_GET['msg'])){
    $msg = $_GET['msg'];
}
?>
<?php 
if(isset($_POST['reset']) && $_POST['reset'] != ""){
    $reset = preg_replace('/^[a-z]/', "", $_POST['reset']);
    require_once("scripts/connect_db.php");
    mysqli_query($connection,"TRUNCATE TABLE questions")or die(mysqli_error($connection));
    mysqli_query($connection,"TRUNCATE TABLE answers")or die(mysqli_error($connection));
    $sql1 = mysqli_query($connection,"SELECT id FROM questions LIMIT 1")or die(mysqli_error($connection));
    $sql2 = mysqli_query($connection,"SELECT id FROM answers LIMIT 1")or die(mysqli_error($connection));
    $numQuestions = mysqli_num_rows($sql1);
    $numAnswers = mysqli_num_rows($sql2);
    if($numQuestions > 0 || $numAnswers > 0){
        echo "Sorry, there was a problem reseting the quiz. Please try again later.";
        exit();
    }else{
        echo "Thanks! The quiz has now been reset back to 0 questions.";
        exit();
    }
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Create A Quiz</title>
<script>
function showDiv(el1,el2){
    document.getElementById(el1).style.display = 'block';
    document.getElementById(el2).style.display = 'none';
}
</script>
<script>
function resetQuiz(){
    var x = new XMLHttpRequest();
            var url = "addQuestions.php";
            var vars = 'reset=yes';
            x.open("POST", url, true);
            x.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            x.onreadystatechange = function() {
        if(x.readyState == 4 && x.status == 200) {
            document.getElementById("resetBtn").innerHTML = x.responseText;
    }
}
x.send(vars);
document.getElementById("resetBtn").innerHTML = "processing...";
}
</script>
<style type="text/css">
.content{
    margin-top:48px;
    margin-left:auto;
    margin-right:auto;
    width:780px;
    border:#333 1px solid;
    border-radius:12px;
    -moz-border-radius:12px;
    padding:12px;
    display:none;
}
</style>
</head>
<body>
   <div style="width:700px;margin-left:auto;margin-right:auto;text-align:center;">
   <p style="color:#06F;"><?php echo $msg; ?></p>
    <h2>What type of question would you like to create?</h2>
    <button onClick="showDiv('tf', 'mc')">True/False</button>&nbsp;&nbsp;<button onClick="showDiv('mc', 'tf')">Multiple Choice</button>&nbsp;&nbsp;
    <span id="resetBtn"><button onclick="resetQuiz()">Reset quiz to zero</button></span>
   </div>
  <div class="content" id="tf">
    <h3>True or false</h3>
        <form action="addQuestions.php" name="addQuestion" method="post">
    <strong>Please type your new question here</strong>
        <br />
            <textarea id="tfDesc" name="desc" style="width:400px;height:95px;"></textarea>
          <br />
        <br />
        <strong>Please select whether true or false is the correct answer</strong>
        <br />
            <input type="text" id="answerswer1" name="answerswer1" value="True" readonly>&nbsp;
              <label style="cursor:pointer; color:#06F;">
            <input type="radio" name="iscorrect" value="answerswer1">Correct Answer?</label>
          <br />
        <br />
            <input type="text" id="answerswer2" name="answerswer2" value="False" readonly>&nbsp;
              <label style="cursor:pointer; color:#06F;">
              <input type="radio" name="iscorrect" value="answerswer2">Correct Answer?
            </label>
          <br />
        <br />
        <input type="hidden" value="tf" name="type">
        <input type="submit" value="Add To Quiz">
    </form>
 </div>
 <div class="content" id="mc">
    <h3>Multiple Choice</h3>
    <form action="addQuestions.php" name="addMcQuestion" method="post">
    <strong>Please type your new question here</strong>
        <br />
        <textarea id="mcdesc" name="desc" style="width:400px;height:95px;"></textarea>
        <br />
      <br />
    <strong>If you want to upload image, please upload here:</strong>
    <br />
        <br/>
            <input type="file" name="submit" />
    <br />
    <br />
    <strong>Please create the first answer for the question</strong>
        <br />
        <input type="text" id="mcanswer1" name="answerswer1">&nbsp;
          <label style="cursor:pointer; color:#06F;">
          <input type="radio" name="iscorrect" value="answerswer1">Correct Answer?
        </label>
      <br />
    <br />
    <strong>Please create the second answer for the question</strong>
    <br />
        <input type="text" id="mcanswer2" name="answerswer2">&nbsp;
          <label style="cursor:pointer; color:#06F;">
          <input type="radio" name="iscorrect" value="answerswer2">Correct Answer?
        </label>
      <br />
    <br />
    <strong>Please create the third answer for the question</strong>
    <br />
        <input type="text" id="mcanswer3" name="answerswer3">&nbsp;
          <label style="cursor:pointer; color:#06F;">
          <input type="radio" name="iscorrect" value="answerswer3">Correct Answer?
        </label>
      <br />
    <br />
    <strong>Please create the fourth answer for the question</strong>
    <br />
        <input type="text" id="mcanswer4" name="answerswer4">&nbsp;
          <label style="cursor:pointer; color:#06F;">
          <input type="radio" name="iscorrect" value="answerswer4">Correct Answer?
        </label>
      <br />
    <br />
    <input type="hidden" value="mc" name="type">
    <input type="submit" name="submit" value="Add To Quiz">
    </form>
 </div>
</body>
</html>

从您的代码来看，$image 未设置。我可以看到您将变量设置为 $image= base64_encode($image);但在此之前尚未设置。

请确保设置$image变量，因为它看起来像您正在尝试执行以下操作：

$image = base64_encode(
        file_get_contents(
            $_FILES['image']['tmp_name']
        )
);

附言如前所述，表单必须使用 multipart/form-data 的 entype，如 @73badf2...的答案所示。

编辑：

我已经在本地测试了此代码，它工作正常。（使用string而不是longblob。

$connection = mysqli_connect('127.0.0.1', 'root', '', 'test');
if (isset($_FILES['image'])) {
    $name = $_FILES['image']['tmp_name'];
    $image = base64_encode(
        file_get_contents(
            $_FILES['image']['tmp_name']
        )
    );
    if (!empty($image)) {
        $result = mysqli_query($connection, "insert into questions (name,image) values ('$name','$image')");
    }
}

是否已设置tmp文件夹的权限？

使用这个：

<form action="addQuestions.php" name="addQuestion" method="post" enctype="multipart/form-data">
.....................
.....................
</form>

我解决了问题。 :)她来自：

<input type="file" name="submit" />

我用"图像"替换了"提交"，现在工作正常。

感谢您的指导！

现在我有另一个问题，用另一个ID发布在数据库中的图像......我研究了原因，但我没有找到答案。如果有想法，请告诉我。

有好的一天！