如何在图片上传PHP上添加随机名称

Question

I'm having trouble adding random numbers or characters on my image uploads to avoid uploads with the same name. 我在为图片上传添加随机数或字符时遇到麻烦，以避免上传具有相同名称的图片。

I found the following, but can't get it to work: 我发现了以下内容，但无法正常工作：

https://www.sitepoint.com/community/t/adding-generated-random-number-to-image-name-before-upload/25950 https://www.sitepoint.com/community/t/adding-generated-random-number-to-image-name-before-upload/25950

This part of the code works: 代码的这一部分工作：

// get the file name
$uploadpath = $uploadpath= $random1 . basename( $_FILES['fileup']['name']);

But the file is not in uploaded in the directory. 但是文件不在目录中。

Here is the full code: 这是完整的代码：

<?php
header("index.php");
// Simple PHP Upload Script:  http://coursesweb.net/php-mysql/
$output = ''; // Make a variable for output
$uploadpath = 'uploads/';      // directory to store the uploaded files
$max_size = 5000;          // maximum file size, in KiloBytes
$alwidth = 1920;            // maximum allowed width, in pixels
$alheight = 1080;           // maximum allowed height, in pixels
$allowtype = array('bmp', 'gif', 'jpg', 'jpe', 'png');        // allowed extensions

if(isset($_FILES['fileup']) && strlen($_FILES['fileup']['name']) > 1) {
  $uploadpath = $uploadpath . basename( $_FILES['fileup']['name']);       // gets the file name
  $sepext = explode('.', strtolower($_FILES['fileup']['name']));
  $type = end($sepext);       // gets extension
  list($width, $height) = getimagesize($_FILES['fileup']['tmp_name']);     // gets image width and height
  $err = '';         // to store the errors

  // Checks if the file has allowed type, size, width and height (for images)
  if(!in_array($type, $allowtype)) $err .= 'The file: <b>'. $_FILES['fileup']['name']. '</b> not has the allowed extension type.';
  if($_FILES['fileup']['size'] > $max_size*5000) $err .= '<br/>Maximum file size must be: '. $max_size. ' KB.';
  if(isset($width) && isset($height) && ($width >= $alwidth || $height >= $alheight)) $err .= '<br/>The maximum Width x Height must be: '. $alwidth. ' x '. $alheight;

  // If no errors, upload the image, else, output the errors
  if($err == '') {
    if(move_uploaded_file($_FILES['fileup']['tmp_name'], $uploadpath)) { 
      $output .= '<br>Direct Link: <input type="text" value="http://'.$_SERVER['HTTP_HOST'].rtrim(dirname($_SERVER['REQUEST_URI']), '\\/').'/'.$uploadpath.'">';
      $output .= '<br>BB Code: <input type="text" value="[img]'.$_SERVER['HTTP_HOST'].rtrim(dirname($_SERVER['REQUEST_URI']), '\\/').'/'.$uploadpath.'[/img]">';
    }
    else $output .= '<b>Unable to upload the file.</b>';
  }
  else $output .= $err;
}
?> 
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Answer 1

You can add time to your image name. 您可以为图像名称添加时间。

$img = basename($_FILES['fileup']['name']); //Get here extension from image
$result = expload('.',$img);
$uploadpath= result[0].date('dmY').'_'.time().'.'.$result[1];

Answer 2

the best way to do this is probably $uploadpath=tempnam($dir,$prefix); 最好的方法可能是$ uploadpath = tempnam（$ dir，$ prefix）; with rename();, it guarantee a unique name and give no chance for a multi-threading/multi-process collision when several images is being uploaded at the same time. 使用rename（）;，它可以保证唯一的名称，并且当同时上传多个图像时，不会发生多线程/多进程冲突。

edit: or, i suggest just giving id number filenames on your filesystem, and store the real names in a database (like SQLite or MySQL), this will protect weird characters from the limitations of your filesystem. 编辑：或者，我建议仅在文件系统上提供ID号文件名，并将真实名称存储在数据库中（例如SQLite或MySQL），这将保护怪异的字符免受文件系统的限制。 for instance, files with / or \\ or chinese characters in the name. 例如，名称中带有/或\\或汉字的文件。 you can get the number from an AUTOINCREMENT PRIMARY id field, which will also guarantee no collision 您可以从AUTOINCREMENT PRIMARY id字段中获取数字，这也将确保不会发生冲突

Answer 3

I use following code to rename the image while uploading and it work properly for me 我在上传时使用以下代码重命名图片，它对我来说正常工作

   $ext = substr(strrchr($_FILES['userfile']['name'], "."), 1);//get extension of uploading imagge
   $new_name = md5(rand() * time()) . ".$ext"; //rename the image

如何在图片上传PHP上添加随机名称

问题描述

3 个解决方案

解决方案1
0 2015-11-28 07:27:00

解决方案2
0 2015-11-28 07:54:41

解决方案3
0 2015-11-28 09:11:51

如何在图片上传PHP上添加随机名称

问题描述

3 个解决方案

解决方案1 0 2015-11-28 07:27:00

解决方案2 0 2015-11-28 07:54:41

解决方案3 0 2015-11-28 09:11:51

解决方案1
0 2015-11-28 07:27:00

解决方案2
0 2015-11-28 07:54:41

解决方案3
0 2015-11-28 09:11:51