Question

我试图创建一个删除上传到我服务器的图像的按钮。但是，当我上传了一张图片后，点击删除无效，它会从页面中删除图片，但是当我检查网站目录时，它仍然存在。另外，DELETION COMPLETE没有回显消息，只是DELETION FAILED，所以它让我想知道它是否有效并且只是刷新页面。不知道为什么会这样，还有一种方法可以让它只在显示图像时显示加载图像gif吗？这就是我所拥有的：

<?php
ob_clean();session_start();

    if (isset($_GET['logout'])){
        session_destroy();  
    }

    if (!isset($_SESSION['loggedin']) || $_SESSION['loggedin'] == false) {
        header("Location: index.php");
    }   

    $loadingimage = false;

    if(isset($_FILES['UploadFileField'])){
        $allowed = array('jpg','png','jpeg');
        $name = $_FILES["UploadFileField"]["name"];
        $tmp = $_FILES['UploadFileField']['tmp_name'];
        $type = $_FILES['UploadFileField']['type'];
        $newName = "Image Attachment.jpg";
        $types = array('jpg','png','jpeg');
        $ext = pathinfo($name, PATHINFO_EXTENSION);

        if(in_array($ext,$types)){
            move_uploaded_file($tmp, "UPLOADS/$newName");
            echo '<font size="3"><p align="center"><b>UPLOAD SUCCESSFUL: </font><font color="#000000" size="3">Your document has now been uploaded and is ready to send.</b></p></font>';
            $loadingimage = true;
        }

        else {
            if(!$tmp){
                echo '<font size="3"><p align="center"><b>UPLOAD FAILED: </font><font color="#000000" size="3">No document has been selected.</b></p></font>';
            }

            else {
                echo '<font size="3"><p align="center"><b>UPLOAD FAILED: </font><font color="#000000" size="3">Uploaded document was an incorrect extension type, please use ".jpg", ".jpeg", or "png" only.</b></p></font>';
            }
        }
    }

    if (isset($_POST['submit'])){
        header( 'Location: Review.php' );
    }

    if (isset($_POST['delete'])){   
        if ($loadingimage == true){
            echo '<font size="3"><p align="center"><b>DETLEION COMPLETE: </font><font color="#000000" size="3">Image no longer available</b></p></font>';
            unlink('UPLOADS/Image Attachment.jpg');
            $loadingimage = false;
        }

        else{
            echo '<font size="3"><p align="center"><b>DETLEION FAILED: </font><font color="#000000" size="3">No image available for deletion</b></p></font>';
        }
    }
?>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <title>Attach Image</title>

        <link href="CSS/boilerplate.css" rel="stylesheet" type="text/css">
        <link href="CSS/master.css" rel="stylesheet" type="text/css">
        <script src="JAVASCRIPT/respond.min.js"></script>
    </head>
<body link="black">
    <div class="gridContainer clearfix">
        <div id="borderDiv">
            <div id="navDiv">
                <div id="backNavDiv">   
                    <a href="CompletedBy.php"><font color="white"><p align="left"><b>&nbsp;&lt;&nbsp;Completed By</b></p></font></a>
                </div>

                <div id="logoutDiv">
                    <a href="index.php?logout"><font color="white"><p align="right"><b>Log Out&nbsp;&gt;&nbsp;</b></p></font></a>
                </div>       
            </div>

            <div id="headerDiv">
                <p>Attach Image</p>
            </div>

                <?php
                    if($loadingimage == false){
                        echo '<div id="imageDiv"><img src="IMAGES/loading.gif"></div>';
                    }

                    else{
                        echo '<div id="imageDiv"><img src="UPLOADS/Image Attachment.jpg"></div>';
                    }
                ?>          

            <div id="loginBtnDiv">
                <div id="uploadAreaDiv">
                    <form action="AttachImage.php" method="post" enctype="multipart/form-data" name="FileUploadForm" id="FileUploadForm">
                    <label for="UploadFileField"></label>
                    <input type="file" name="UploadFileField" id="UploadFileField"/>
                    <input type="submit" name="UploadButton" id="UploadButton" value="Upload"/>
                    </form>     
                </div>

                <form action="AttachImage.php" method="post" enctype="multipart/form-data" name="delete" id="delete">
                    <input id="delete" name="delete" type="submit" value="Delete">
                </form>

                <form action="AttachImage.php" method="post" enctype="multipart/form-data" name="FileForm" id="FileForm">
                    <input id="submit" name="submit" type="submit" value="Next">
                </form>
            </div>             
        </div>
    </div>
    <div id="logoDiv">
        <img src="IMAGES/Logo.png">
    </div>
</body>
</html>

Answer 1

您的$loadingimage变量始终为false。所以你永远不会执行unlink()函数。如果您认为它是真的，因为您在true中将其设置为if(isset($_FILES['UploadFileField'])){}，则不会，因为您的网页已重新加载并且您已将$_POST['delete']传递到该页面并{{1 }}变量将再次设置为false。所以删除条件 $loadingimage并且您的代码应该有效。我完全没有看到你为什么会这样做的原因。

Answer 2

正如我之前评论的那样，因为您定义了$loadingimage = false;，所以如果文件同时上传，您将只能删除该文件 - 这似乎毫无意义。

您应该检查文件是否存在，而不是使用$loadingimage变量来取消链接文件。

你可以改变

if ($loadingimage == true){

带

if (file_exists("UPLOADS/Image Attachment.jpg")) {

这只会删除文件（如果存在），并阻止unlink引发警告。

图片删除按钮无法正常运行？

2 个答案: