Question

我有这个恼人的问题：

下面你会看到我凌乱的上传脚本，每当我上传一个视频文件时，我都会使用md5函数来命名它，这样我的数据库/文件夹中就没有相同名称的视频文件了。

问题在于，当我多次将某个给定文件上传到数据库时，每次都会以相同的md5文件名存储它。如果你能帮助我修复这个小虫子，我真的很感激。我可能累了什么的。我尝试了一百种不同的解决方案，并没有修复它。

这是我的烂摊子：

<?php

class Upload_model extends CI_Model {

    var $gallery_path;
    var $videos_path;
    var $thumbnail;
    var $video_name;
    var $upload_data;
    var $file_name;
    var $name;
    var $videos_folder = "http://localhost/upload/videos/";

    //////////////////////////////


    function Upload_model() {

        parent::__construct();
        $this->videos_path = realpath(APPPATH . '..\videos');
//        $this->returnFromDatabase();
    }

    function do_upload() {

        $name = $_FILES['userfile']['name']; // get file name from form
        $fileNameParts = explode(".", $name); // explode file name to two part
        $fileExtension = end($fileNameParts); // give extension
        $fileExtension = strtolower($fileExtension); // convert to lower case
        $encripted_pic_name = md5($name) . "." . $fileExtension;  // new file name
        $config['file_name'] = $encripted_pic_name; //set file name


        $config = array(
            'allowed_types' => 'avi|mp4|flw|mov',
            'upload_path' => $this->videos_path,
            'file_name' => $encripted_pic_name
        );

        $this->load->library('upload', $config);



        if ($this->upload->do_upload()) {


            $this->upload_data = $this->upload->data(); //Returns array of containing all of the data related to the file you uploaded.
            $this->file_name = $this->upload_data['file_name'];


            $this->getThumbImage('C:\\xampp\\htdocs\\upload\\videos\\' . $encripted_pic_name);


            $insert_data = array(
                'name' => $encripted_pic_name,
                'path' => 'C:\\xampp\\htdocs\\upload\\videos\\' . $encripted_pic_name,
                'thumb_path' => 'C:\\xampp\\htdocs\\upload\\videos\\' . $encripted_pic_name . "_t.jpeg",
                'uploaded_by' => 'admin'
            );

            $this->db->insert('videos', $insert_data); //load array to database 

            redirect('/welcome');
        }
    }

    function getVideoInformation($videoPath) {
        $movie = new ffmpeg_movie($videoPath, false);

        $this->videoDuration = $movie->getDuration();
        $this->frameCount = $movie->getFrameCount();
        $this->frameRate = $movie->getFrameRate();
        $this->videoTitle = $movie->getTitle();
        $this->author = $movie->getAuthor();
        $this->copyright = $movie->getCopyright();
        $this->frameHeight = $movie->getFrameHeight();
        $this->frameWidth = $movie->getFrameWidth();
        $this->pixelFormat = $movie->getPixelFormat();
        $this->bitRate = $movie->getVideoBitRate();
        $this->videoCodec = $movie->getVideoCodec();
        $this->audioCodec = $movie->getAudioCodec();
        $this->hasAudio = $movie->hasAudio();
        $this->audSampleRate = $movie->getAudioSampleRate();
        $this->audBitRate = $movie->getAudioBitRate();
    }

    function getAudioInformation($videoPath) {
        $movie = new ffmpeg_movie($videoPath, false);

        $this->audioDuration = $movie->getDuration();
        $this->frameCount = $movie->getFrameCount();
        $this->frameRate = $movie->getFrameRate();
        $this->audioTitle = $movie->getTitle();
        $this->author = $movie->getAuthor();
        $this->copyright = $movie->getCopyright();
        $this->artist = $movie->getArtist();
        $this->track = $movie->getTrackNumber();
        $this->bitRate = $movie->getBitRate();
        $this->audioChannels = $movie->getAudioChannels();
        $this->audioCodec = $movie->getAudioCodec();
        $this->audSampleRate = $movie->getAudioSampleRate();
        $this->audBitRate = $movie->getAudioBitRate();
    }

    function getThumbImage($videoPath) {
        $movie = new ffmpeg_movie($videoPath, false);
        $this->videoDuration = $movie->getDuration();
        $this->frameCount = $movie->getFrameCount();
        $this->frameRate = $movie->getFrameRate();
        $this->videoTitle = $movie->getTitle();
        $this->author = $movie->getAuthor();
        $this->copyright = $movie->getCopyright();
        $this->frameHeight = $movie->getFrameHeight();
        $this->frameWidth = $movie->getFrameWidth();

        $capPos = ceil($this->frameCount / 4);

        if ($this->frameWidth > 120) {
            $cropWidth = ceil(($this->frameWidth - 120) / 2);
        } else {
            $cropWidth = 0;
        }
        if ($this->frameHeight > 90) {
            $cropHeight = ceil(($this->frameHeight - 90) / 2);
        } else {
            $cropHeight = 0;
        }
        if ($cropWidth % 2 != 0) {
            $cropWidth = $cropWidth - 1;
        }
        if ($cropHeight % 2 != 0) {
            $cropHeight = $cropHeight - 1;
        }

        $frameObject = $movie->getFrame($capPos);


        if ($frameObject) {
            $imageName = $this->file_name . "_t.jpeg";
            $tmbPath = "C:\\xampp\\htdocs\\upload\\videos\\" . $imageName;
            $frameObject->resize(120, 90, 0, 0, 0, 0);
            imagejpeg($frameObject->toGDImage(), $tmbPath);
        } else {
            $imageName = "";
        }


        return $imageName;
    }

}

Answer 1

md5在相同的字符串上使用时将始终返回相同的值，因此上传具有相同名称的文件将以相同的哈希结尾，将随机字符串添加到文件名

$encripted_pic_name = md5(microtime() . $name) . '.' . $fileExtension

您还需要注意md5（）可能会发生冲突，其中两个不同的字符串将具有相同的输出。我不会为了你的需要而过分担心。

Answer 2

重要的是，CI的上传类有一个名为encrypt_name的属性。您可以将其设置为true，并在默认情况下加密文件名，而无需执行其他操作。看看：http://ellislab.com/codeigniter/user-guide/libraries/file_uploading.html
此外，由于您使用的是CI，请使用上传类，当CI提供的内容非常容易使用时，请不要自己编写。

Answer 3

在md5之前，您需要在名称上添加一些随机字符（尽管即便如此，它仍然有可能重复名称）。

E.g：

$encripted_pic_name = md5($name . $randomStringHere) . "." . $fileExtension;  // new file name

md5将始终为相同的输入提供相同的输出，因此如果您上传相同的文件两次，那么是，您已经使用了该哈希。

如果您只想要随机名称，那么您甚至不需要使用MD5，并且每次上传文件时都可以动态创建随机字符串（a，b，c等到z，然后是aa，ab，ac等等。）

Answer 4

如果文件名相同，那么它将返回相同的md5 hash 为此，您必须encrypt unique name or number

您可以使用

$encripted_pic_name = md5(strtotime()) . "." . $fileExtension;  // new file name

或

$encripted_pic_name = md5(uniqid()) . "." . $fileExtension; // new file name

Codeigniter - 每次上传时都使用相同的md5名称

4 个答案: