Question

我正在尝试创建一个接受CSV文件的网页，最终将其上传到数据库，但是如果存在另一个具有相同名称的文件，我目前仍然坚持让它覆盖自己。目前我有以下内容：

index.html -

    <form action="upload.php" method="post" enctype="multipart/form-data">
        Select CSV file to upload
        <input type="file" name="fileToUpload" accept=".csv">
        <input type="submit" value="Upload File" name="submit">
    </form>

upload.php -

    <?php
    ini_set('display_errors',1);
    error_reporting(E_ALL);

    function print_array($array)
    {
        //---//
        //print out an array in a way that doesn't make you want to vommit.
        //---//
        echo "<pre>";
        print_r($array);
        echo "</pre><p>";
    }

    if(isset($_POST['overwrite_YES']))
    {
        $_FILES['fileToUpload']['name'] = $_POST['name'];
        $_FILES['fileToUpload']['type'] = $_POST['type'];
        $_FILES['fileToUpload']['tmp_name'] = $_POST['tmp_name'];
        $_FILES['fileToUpload']['error'] = $_POST['error'];
        $_FILES['fileToUpload']['size'] = $_POST['size'];
        $_FILES['fileToUpload']['tmp_name'] = str_replace("/","\\",$_FILES['fileToUpload']['tmp_name']);

        $target_dir = "uploads/";
        $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
        $fileType = pathinfo($target_file,PATHINFO_EXTENSION);

        print_array($_FILES);
        if (!file_exists($_FILES['fileToUpload']['tmp_name']))
        {
            echo "tmp file does not exists.<br>";
        }
        echo "fileToUpload: " . $_FILES['fileToUpload']['tmp_name'] . " -> " . $target_file . "<br>";
        //unlink($target_file);
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) 
        {
            echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
        }
        else 
        {
            echo "womp womp :(";
        }
        exit;
    }

    else if(isset($_POST['overwrite_NO']))
    {
        $temp_name = $_POST['temp_name'];
        unlink($temp_name);
        echo "upload cancelled.<br>";
        exit;
    }


    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $fileType = pathinfo($target_file,PATHINFO_EXTENSION);



    if($fileType != "csv" ) {
        echo "Sorry, only CSV files are allowed. ";
    }
    else 
    {
        if (file_exists($target_file))
        {
            print_array($_FILES);
            $temp_name = "D:/xampp/tmp/ASMTMP.tmp";
            move_uploaded_file($_FILES['fileToUpload']['tmp_name'], $temp_name);

            echo "the file '" . $target_file . "' already exists.<br>";
            echo "would you like to overwrite this?<br>";
            echo "<form id='overwrite' action=" . $_SERVER['PHP_SELF'] . " method='post' enctype='multipart/form-data'>";
            echo "<input type='hidden' name='name' value='" . $_FILES['fileToUpload']['name'] . "' />";
            echo "<input type='hidden' name='type' value='" . $_FILES['fileToUpload']['type'] . "' />";
            echo "<input type='hidden' name='tmp_name' value='" . $temp_name . "' />";
            echo "<input type='hidden' name='error' value='" . $_FILES['fileToUpload']['error'] . "' />";
            echo "<input type='hidden' name='size' value='" . $_FILES['fileToUpload']['size'] . "' />";
            echo "<input name='overwrite_YES' style='height:40; width:150;' type='submit' value='Yes' />";
            echo "</form>";
            echo "<form id='nooverwrite' action=" . $_SERVER['PHP_SELF'] . " method='post'>";
            echo "<input name='overwrite_NO' style='height:40; width:150;' type='submit' value='No' />";
            echo "<input type='hidden' name='temp_name' value='" . $temp_name . "' />";
            echo "</form>";


        }
        else if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) 
        {
            print_array($_FILES);
            echo "fileToUpload: " . $_FILES['fileToUpload']['tmp_name'] . " -> " . $target_file . "<br>";
            echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
        } 
        else 
        {
            echo "Sorry, there was an error uploading your file.";
        }
    }
    ?>

所以当我通过这个时，一切都正常工作，除了一行读取'womp womp :('。如果该文件不存在。它写得正确。如果文件确实存在，它会正确写入临时文件，但是当我尝试实际覆盖现有文件时，if（move_uploaded_file ...）会跳过并转到else语句。

成功写入的输出如下：

    Array
    (
        [fileToUpload] => Array
            (
                [name] => test.csv
                [type] => application/octet-stream
                [tmp_name] => D:\xampp\tmp\phpFEE0.tmp
                [error] => 0
                [size] => 488007
            )

    )
    fileToUpload: D:\xampp\tmp\phpFEE0.tmp -> uploads/test.csv
    The file test.csv has been uploaded.

失败覆盖的输出如下所示：

    Array
    (
        [fileToUpload] => Array
            (
                [name] => test.csv
                [type] => application/octet-stream
                [tmp_name] => D:\xampp\tmp\ASMTMP.tmp
                [error] => 0
                [size] => 488007
            )
    )
    fileToUpload: D:\xampp\tmp\ASMTMP.tmp -> uploads/test.csv
    womp womp :(

我试图在覆盖之前使用取消链接，以确保它没有实际覆盖的问题，但这没有帮助。而且我没有收到任何错误，所以非常感谢任何帮助。

Answer 1

您正在覆盖$ _FILES变量的值。

删除以下行：

        $_FILES['fileToUpload']['name'] = $_POST['name'];
        $_FILES['fileToUpload']['type'] = $_POST['type'];
        $_FILES['fileToUpload']['tmp_name'] = $_POST['tmp_name'];
        $_FILES['fileToUpload']['error'] = $_POST['error'];
        $_FILES['fileToUpload']['size'] = $_POST['size'];
        $_FILES['fileToUpload']['tmp_name'] = str_replace("/","\\",$_FILES['fileToUpload']['tmp_name']);

Answer 2

最后我改变了

if（move_uploaded_file（$ _ FILES [＆＃34; fileToUpload＆＃34;] [＆＃34; tmp_name＆＃34;]，$ target_file） ...

到

if（rename（$ _ FILES [＆＃34; fileToUpload＆＃34;] [＆＃34; tmp_name＆＃34;]，$ target_file）） ...

解决了我遇到的问题，以防其他人遇到这个问题。我认为＆＃39;也许问题可能是因为＆＃39; move_uploaded_file＆＃39;不会工作，因为我创建了一个新的tmp文件？我认为它不是那样的。

尝试覆盖时move_uploaded_file没有写入

2 个答案: