为上传的图像指定mysqli的唯一名称 [英] Giving uploaded images a unique name for mysqli

问题描述

我希望允许用户上传图像而不会出现由多个用户上传可能具有相同图像名称的图像引起的冲突问题.我不知道如何执行此操作，也不知道从哪里开始.

I want to allow users to upload images without conflicting problems that may be caused by multiple users uploading images that potentially have the same image name. I am stumped on how to execute this and I have no idea where to start..

这是我的代码:

 if(isset($_POST['submitimage'])){
                move_uploaded_file($_FILES['file']['tmp_name'],"pictures/".$_FILES['file']['name']);
                $con = mysqli_connect("localhost","root","","database");
                $q = mysqli_query($con,"UPDATE users SET image = '".$_FILES['file']['name']."' WHERE user_id = '".$_SESSION['user']."'");
                 header("Location: index.php");
        }
?>

任何帮助都将是惊人的.谢谢！

Any help would be amazing. Thank you!

推荐答案

我的解决方案是为每个上传的文件生成一个随机字符串，即:

My solution is to generate a random string for each uploaded file, i.e.:

<?php
   if(!empty($_POST['submitimage'])){
                //get file extension.
                $ext = pathinfo($_FILES['file']['name'])['extension'];
                //generate the new random string for filename and append extension.
                $nFn = generateRandomString().".$ext";
                move_uploaded_file($_FILES['file']['tmp_name'],"pictures/".$nFn);
                $con = mysqli_connect("localhost","root","","database");
                $q = mysqli_query($con,"UPDATE users SET image = '{$nFn}' WHERE user_id = '{$_SESSION['user']}'");
                 header("Location: index.php");
        }

function generateRandomString($length = 10) {
    return substr(str_shuffle("abcdefghijklmnopqrstuvwxyz"), 0, $length);
}

?>

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