PHP

Question

我创建了一个多图像上传表单（图像存储在一个文件夹中，信息存储在 MySQL 数据库中）。图像关联了一些信息，如描述、名称等。
经常，当我上传很多图片（比如 3,4）时，one/two 的图片没有上传，并且出现错误消息出现（上传文件时发生错误）。然后，如果我重试上传未上传的图片，不会发生错误。有时追加，有时不追加，不明白是什么问题（我觉得不正常）。
在这里你可以看到我的 PHP 代码和我的 HTML 表格：

当用户点击 input type="file" 时，我的代码只是创建另一个输入并隐藏旧的（这样，如果用户想要上传更多文件，已经上传的文件不会被删除）。

function boomFunction(obj) {
            obj.style.display = 'none';
            $(".upload-container").append("<input name='upload[]' type='file' multiple='multiple' id='upload' class='upload' onclick='boomFunction(this)' title='Carica un altro file!'>");
         }

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="result.php" method="post" enctype="multipart/form-data" class="form-inline" autocomplete="off" novalidate>          
            <div class="upload-container">
              <input name="upload[]" type="file" multiple="multiple" id="upload" class="upload" required="required" aria-required="true" onclick="boomFunction(this)" title="Choose a file!">
            </div><br>
            
            <label>Subjects:</label>
            <textarea type="text" id="argomenti" name="argomenti" required="required" aria-required="true" placeholder="Subjects..."></textarea><br>
                
            <label for="anno">Year:</label>
            <select id="anno" name="anno" required="required" aria-required="true">
                <option value="" disabled selected>Choose year</option>
                <option value="2016-2017">2016-2017</option>
                <option value="2017-2018">2017-2018</option>
                <option value="2018-2019">2018-2019</option>
            </select><br>
            
            <input type="submit" value="Carica i file" class="upload_button"><br><br><br>
               
</form>

然后，这是我的 result.php 页面。

<?php
                    $total = count(array_filter($_FILES['upload']['name'])); // Count the number of uploaded files
                    $timestamp = time();
                    if ($total==0) {
                        echo "<h2>You must upload at least one file.</h2>";
                        $uploadOk = 0;
                    } else {
                        for($i = 0; $i < $total; $i++) {
                            $tmpFilePath = $_FILES['upload']['tmp_name'][$i];
                            if ($tmpFilePath != '') {
                                $newFilePath = "./uploadFiles/" . $_FILES['upload']['name'][$i];
                                $nomeCompletoFile = basename($_FILES["upload"]["name"][$i]);
                                $target_file = "uploads/$nomeCompletoFile"; $uploadOk = 1;
                                $estensione = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
                                if($estensione != 'jpg' && $estensione != 'png' && $estensione != 'jpeg') {
                                    echo "<h2>Just JPG e PNG files are allowed.</h2>";
                                    $uploadOk = 0;
                                }
                                elseif (empty($_POST["argomenti"]) or empty($_POST["anno"])) {
                                    echo "<h2>You cannot leave empty fields</h2>";
                                    $uploadOk = 0;
                                } else {
                                    $nomeFile = str_replace(".$estensione", '', $nomeCompletoFile);
                                    $string = base64_encode(openssl_random_pseudo_bytes(15)); // Random 15 letters for the new file name
                                    $id = rand(1, 100000); $nomeFinaleFile = 'uploads/'.$string.$id.'.'.$estensione;
                                    if (move_uploaded_file($_FILES["upload"]["tmp_name"][$i], $nomeFinaleFile)) {
                                        $argomenti = stripslashes(htmlspecialchars($_POST['argomenti']));
                                        $anno = $_POST['anno'];
                                        $mysqli = new mysqli('localhost', 'name', '', 'my_name');
                                        $mysqli->query("INSERT INTO uploads (timestamp, file, argomenti, anno, nFile) VALUES ('$timestamp', '$nomeFinaleFile', '$argomenti', '$anno', '$i')");
                                          echo "<h2>The file <i>$nomeFile</i> has been uploaded.</h2>";
                                    } else echo "<h2>An error has occurred while uploading the file</h2>";
                                }
                            }
                        }
                    }
                ?>

貌似没有错误，确实有时候一切正常。
任何帮助将不胜感激

Answer 1

使用 base64encode url 安全

替换

$string = base64_encode(openssl_random_pseudo_bytes(15)); // Random 15 letters for the new file name

至

$string = rtrim(strtr(base64_encode(openssl_random_pseudo_bytes(15)), ['+' => '-', '/' => '_']), '=');

PHP - 多张图片上传时经常出错

PHP - Frequent error on multiple images upload

upload

image-uploading