PHP - md5 和唯一的 $_file 名称 - PHP - md5 and unique $_file name

PHP - md5 and unique $_file name

本文关键字：file 名称唯一 md5 PHP | 更新日期: 2023-09-27

我有一个PHP函数，用于将图像向上移动到服务器，

但是我很困惑，我想为当前上传的文件提供一个唯一的md5名称。这是我的代码：

if ((getimagesize($_FILES['user_image']['tmp_name']) >0) && $_FILES['user_image']['size'] > 0 && ($_FILES['user_image']['size'] < 1048576)){
        $uploaddir  = DIR.'/images/';
        $uploadfile = $uploaddir . basename($_FILES['user_image']['name']);
        move_uploaded_file($_FILES['user_image']['tmp_name'], $uploadfile);
        // check if user have already uploaded an image, then delete 
        //it before uploading new one
        $old_file = db_user_image($user, 'image');
        if (strlen($old_file)){ 
            $delete = $uploaddir.$old_file;
            if (file_exists($delete))  
                unlink ($delete); 
        }
        db_save_user_image($user, 'image', $_FILES['user_image']['name']) ;
}

请告诉我如何为该文件提供唯一的 md5 名称。

按如下方式更改$uploadfile声明：

$ext = pathinfo( $_FILES['user_image']['name'], PATHINFO_EXTENSION);
$uploadfile = $uploaddir . md5(basename($_FILES['user_image']['name']) ).$ext;

如果您只想为文件提供 md5 名称，则需要更改行

$uploadfile = $uploaddir . basename($_FILES['user_image']['name']);

自

$uploadfile = $uploaddir . md5(basename($_FILES['user_image']['name']));

和

db_save_user_image($user, 'image', $_FILES['user_image']['name']) ;

自

db_save_user_image($user, 'image', md5(basename($_FILES['user_image']['name'])));

只需在md5上替换basename即可。

basename 返回路径的尾随名称部分

我添加了时间戳并使用md5()对其进行加密。它应该为文件生成一个唯一的名称。

   $targetFile = md5(time()).$_FILES['user_image']['name'];

并使用$targetFile代替脚本中的$_FILES['user_image']['name']。

//Code
if ((getimagesize($_FILES['user_image']['tmp_name']) >0) && $_FILES['user_image']['size'] > 0 && ($_FILES['user_image']['size'] < 1048576)){
    $uploaddir  = DIR.'/images/';
    $targetFile = md5(time()).$_FILES['user_image']['name'];
    $uploadfile = $uploaddir.$targetFile;
    move_uploaded_file($_FILES['user_image']['tmp_name'], $uploadfile);
    // check if user have already uploaded an image, then delete 
    //it before uploading new one
    $old_file = db_user_image($user, 'image');
    if (strlen($old_file)){ 
        $delete = $uploaddir.$old_file;
        if (file_exists($delete))  
            unlink ($delete); 
    }
    db_save_user_image($user, 'image', $targetFile) ;

}