表格:
<div id="maindiv">
<div id="formdiv">
<h2>Multiple Image Upload Form</h2>
<form enctype="multipart/form-data" action="" method="post">
First Field is Compulsory. Only JPEG,PNG,JPG Type Image Uploaded. Image Size Should Be Less Than 100KB.
<hr/>
<div id="filediv"><input name="file[]" type="file" id="file"/></div><br/>
<input type="button" id="add_more" class="upload" value="Add More Files"/>
<input type="submit" value="Upload File" name="submit" id="upload" class="upload"/>
</form>
<br/>
<br/>
<!-------Including PHP Script here------>
<?php include "upload.php"; ?>
</div>
</div>
剧本:
<?php
if (isset($_POST['submit'])) {
$j = 0; //Variable for indexing uploaded image
$target_path = "uploads/"; //Declaring Path for uploaded images
for ($i = 0; $i < count($_FILES['file']['name']); $i++) {//loop to get individual element from the array
$validextensions = array("jpeg", "jpg", "png"); //Extensions which are allowed
$ext = explode('.', basename($_FILES['file']['name'][$i]));//explode file name from dot(.)
$file_extension = end($ext); //store extensions in the variable
$target_path = $target_path . md5(uniqid()) . "." . $ext[count($ext) - 1];//set the target path with a new name of image
$j = $j + 1;//increment the number of uploaded images according to the files in array
if (($_FILES["file"]["size"][$i] < 100000) //Approx. 100kb files can be uploaded.
&& in_array($file_extension, $validextensions)) {
if (move_uploaded_file($_FILES['file']['tmp_name'][$i], $target_path)) {//if file moved to uploads folder
echo $j. ').<span id="noerror">Image uploaded successfully!.</span><br/><br/>';
} else {//if file was not moved.
echo $j. ').<span id="error">please try again!.</span><br/><br/>';
}
} else {//if file size and file type was incorrect.
echo $j. ').<span id="error">***Invalid file Size or Type***</span><br/><br/>';
}
}
}
?>
此脚本还使用javascript进行多个图片上传。
在网络浏览器中点击 &#34;页面重新加载&#34; 时, 之后第一次上传已经完成, 然后 脚本会为同一个文件分配 新的ID代码 并移动图像将 第二次 文件存入&#34;上传&#34; 文件夹。
如何阻止脚本将图像文件(为名称分配新的ID代码) 第二次移动到&#34;上传&#34; 文件夹?
非常感谢任何建议。
修改
所以,我选择了#34;重定向&#34;在提交完成后,表单获取 清除 的同一页面。
看起来,这是实现它的方法。
答案 0 :(得分:0)
在上传之前(您显示上传表格),您可以创建一个密钥(随机)并将其存储在您的服务器上。 (临时文件夹)(使用序列号更安全) 您可以在上传表单中将其包含为“隐藏”值。 正在处理上传的脚本应首先查找此密钥,如果存在,您可以将其删除并继续重命名/上传/您想要执行的任何操作。 如果密钥消失了,您可以确定它是一个重复的请求,只需忽略它。
不要忘记每次都清理你的临时文件夹(假设删除超过一小时左右的每个键)