在 Db 中保留较旧的上传图像

Question

我的客户仪表板中有一个页面用于编辑他的关于内容。

一旦我点击编辑按钮，它就会重定向到另一个页面，并且有一个选项可以上传新图片和内容。

问题：如果没有上传新图片假设只有一些文本字段被更改并点击更新文本内容更改并重定向到主页但图像从数据库中删除，但我不想删除图像如果没有上传新图片，则从数据库中获取。

有两个文件 1)index.php 2)editabout.php

index.php

<div class="main-container">
<div class="row">
    <div class="container">
        <div class="col-lg-12">
            <div class="row">
                <?php include('db.php'); $select=mysql_query("SELECT * FROM `about`"); while($row=mysql_fetch_array($select)){?>
                <div class="col-md-3"><img id="profileimage" src="about/<?php echo $row['image']; ?>" style="width:100%;height:200px;" class="img-thumbnail img-responsive" required>
                    <div class="row">
                        <div class="col-md-6"> <a href="editaboutimg.php?bid=<?php echo $row['sl.no']; ?>" onclick="return confirm('Are you sure you want to Edit this image?');"><input style="width:100%;" class="btn btn-info btn-lg mb-3 mr-3" type="submit" value="Edit"></a></div>
                    </div>
                </div>
                <?php}?>
            </div>
        </div>
    </div>
</div>

editabout.php

<div class="row">
<div class="col-lg-4">
  <form action="" method="post" enctype="multipart/form-data">
  <div class="main-container file-upload">
    <div class="file-upload__dropzone">
    <?php
    include('db.php');
    $select=mysql_query("SELECT * FROM `about` where `sl.no`='$bid' ");
    while($row=mysql_fetch_array($select)){
    ?>
    <img id="profileimage" src="about/<?php echo $row['image']; ?>" value="<?php echo $row['image']; ?>" class="img-thumbnail img-responsive" style="width:100%;height:200px;">
    <?php } ?>

      <div class="file-upload__browse-files">
        <button class="btn btn-outline-info btn-lg btn-block btn-rounded file-upload__browse-btn">Browse files</button>
        <input id="upload-files-default" name="img" type="file" multiple class="upload" onchange="readURL(this);">
      </div><br>
     <button class="btn btn-success btn-lg mb-2 mr-3" name="ok" type="submit">Update</button>
    </div>
    </div>
    </form>
    </div>

Php上传代码

include('db.php');
if(isset($_POST['ok']))
{
$photo=$_FILES['img']['name'];  
$target_dir = "about/"; 
$location = $target_dir .$_FILES["img"]["name"];
move_uploaded_file($_FILES['img']['tmp_name'],$location);
$query1="UPDATE `about` SET `image`='$photo',
        `up_date`=now()
         WHERE `about`.`sl.no` ='$bid'";
mysql_query($query1);

Answer 1

您必须在执行任何查询之前检查文件 exist/uploaded 是否存在。举个例子：

if(is_uploaded_file($_FILES["img"]["tmp_name"] && file_exists($_FILES["img"]["tmp_name"])){
   //update query with picture
   //move_uploaded_file here
}else{
  //Only query updating does details without move_uploaded_file
}

以上代码必须放在if(isset($_POST["ok"]))代码块中。

在 Db 中保留较旧的上传图像

Retaining Older Uploaded Image In Db

html

php

image-uploading