php - 删除条目时取消链接文件名有效，但更新条目时无效

Question

我有一个图像上传表单，可以从数据库和服务器中添加、更新和删除图像文件路径。

目前，当我删除图像条目时，该条目会从数据库和服务器文件夹中正确删除。

但是当我更新一个条目时，会在服务器文件夹中创建一个新的文件名，并且旧的图像文件仍然存在。

当我更新时，我希望在数据库中更新新的图像文件，同时取消与服务器的链接。

这是 crud.php 的摘录：

// If the data is not empty
    if ((!empty($image['name']) && !empty($title) && !empty($comma_tags))) {
        if(!empty($image)) {
            $filename = basename($image['name']);

            // Get file extension in lower case
            $fileType = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
            echo $fileType;

            // Generate a unique name for the image to prevent throwing exists error
            $unique_image_name = rand(10000, 990000) . '_' . time() . '.' . $fileType;

            // The path of the new uploaded image
            $targetFilePath = $uploadDir . $unique_image_name;
            echo $targetFilePath;

            if (in_array($fileType, $allowTypes)) {
                
                // Check to make sure the image is valid
                if ((!empty($image['tmp_name']) && getimagesize($image['tmp_name']))) {

                    if (file_exists($unique_image_name)) {
                        $statusMsg = 'Image already exists, please choose another or rename that image.';

                    } else if ($image['size'] > 50000) {
                        $statusMsg = 'Image file size too large, please choose an image less than 500kb.';
                    } else {
                        // Everything checks out now we can move the uploaded image
                        if (move_uploaded_file($image['tmp_name'], $targetFilePath)){
                            $imgData['filename'] = $unique_image_name;
                            $imgData['username'] = $_SESSION['username'];

                            // Create unique viewkey for image 13 characters long
                            $newViewkey = uniqid();
                            $imgData['viewkey'] = $newViewkey;

                            $statusMsg = 'Success! Your image was uploaded.';
                            $status = 'success';
                            
                        } else {
                            $statusMsg = 'Sorry, there was an error uploading your file.';
                        }
                    }
                }
                } else {
                        $statusMsg = 'Image file is empty or corrupt.';
                }
            } else {
                $statusMsg = 'Sorry, only JPG, JPEG, PNG && GIF files are allowed to be uploaded.';
            }
        } else {
            $statusMsg = 'Sorry something went wrong.';
        }

        if (!empty($viewkey)) {
            // Previous filename
            $conditions['where'] = array('viewkey' => $_GET['viewkey'],);
            $conditions['return_type'] = 'single';
            $prevData = $imageDB->getRows('image', $conditions);

            // Update data
            $condition = array('viewkey' => $viewkey);
            $update = $imageDB->update($tblName, $imgData, $condition);

            if($update) {
                //Remove old file from server
                if (!empty($imgData['filename'])) {
                    unlink($uploadDir . $prevData['filename']);
                }
                $status = 'success';
                $statusMsg = 'Image data has been updated successfully.';
                $sessData['postData'] = '';

                $redirectURL = VIEW . 'manage_uploads.php';
            } else {
                $statusMsg = 'Some problem occurred, please try again.';
                //Set redirect url
                $redirectURL .= $viewkeyStr;
            }
        } elseif (!empty($imgData['filename'])) {
            // Insert data
            $insert = $imageDB->insert($tblName, $imgData);

            if ($insert) {
                $status = 'success';
                $statusMsg = 'Image has been uploaded successfully.';
                $sessData['postData'] = '';

                $redirectURL = VIEW . 'manage_uploads.php';
            } else {
                $statusMsg = 'Some problem occurred, please try again.';
            }
        
    } else {
        $statusMsg = 'All fields are mandatory, please fill all the fields.';
    }

    // Status message
    $sessData['status']['type'] = $status;
    $sessData['status']['msg'] = $statusMsg;

} elseif (($_REQUEST['action_type'] == 'delete') && !empty($_GET['viewkey'])) {
    // Previous filename
    $conditions['where'] = array(
        'viewkey' => $_GET['viewkey'],
    );
    $conditions['return_type'] = 'single';
    $prevData = $imageDB->getRows('image', $conditions);

    // Delete data
    $condition = array(
        'viewkey' => $_GET['viewkey']
    );
    $delete = $imageDB->delete($tblName, $condition);
    
    if ($delete) {
        // Remove old file from server
        unlink($uploadDir . $prevData['filename']);