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A perfect usage example of PHP file upload class_PHP tutorial

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This file upload class can customize the upload file size, upload file type and file storage address. It is also very convenient to use. There is an article that if the file name is in Chinese, it will be garbled when uploaded, so everyone’s solution is Save the page as uft8 to solve the problem.

Today I can finally update the paperen website. Well... I am tired of writing my thesis, so I will publish an article about uploading files. I also wrote this category myself. I don’t know if it will be useful to everyone. Is it useful? If you think you can, use it. However, I still haven't done a good job in encoding. I submitted the data on the utf8 page, so if the generated file keeps its original Chinese name, it will have a garbled name in the folder. If you don't want garbled characters, you need to do it. Let's do some encoding conversion. ?

The code is as follows

Copy code

define('NO_FILE', 'No uploaded file');
define('NOT_ALLOW_EXT', 'The file type is not within the allowed range');
define('NOT_ALLOW_SIZE', 'The file size is not within the allowed range');
define('HAS_THE_FILE', 'The file already exists');
define('UPLOAD_FAILED', 'Upload failed');
define('UPLOAD_SUCCESS', 'Upload successful');

class file_uploader
{

    var $_file;
    var $_filesize;
    var $_fileext;
    var $_filedir;
    var $_filename;
    var $_filetmpname;

    var $allowsize;
    var $allowext;

    var $neednewname;
    var $newname;
    var $syslang;

    var $report;

    function ready($filedir = '', $file, $allowsize = '', $allowext = '', $neednewname = false, $report = 0){
        $this->_filedir = is_dir($filedir) ? $filedir : '';
        if(empty($file) || !isset($file['size']) || $file['size'] == 0) $this->error(NO_FILE);
        $this->_filesize = $file['size'];
        $this->_filename = $file['name'];
        $this->_filetmpname = $file['tmp_name'];

        $this->allowsize = $allowsize;
        $this->allowext = $allowext;

        $this->neednewname = ($neednewname) ? true : false;
        $this->newname = '';

        $this->report = $report;
    }

    function do_upload(){
        if(!is_uploaded_file($this->_filetmpname)) $this->error(NO_FILE);
        if($this->chk_ext()){
            $this->error(NOT_ALLOW_EXT);
            return '';
        }
        if($this->chk_size()){
            $this->error(NOT_ALLOW_SIZE);
            return '';
        }
        if($this->neednewname) $this->newname = $this->generate_name().".".$this->get_fileext();
        if($this->chk_hasfile()){
            $this->error(HAS_THE_FILE);
            return '';
        }
        $filename = empty($this->newname) ? @iconv('utf-8','gb2312',$this->_filename) : $this->newname;
        @chmod($this->_filedir.$filename, 0777);
        if(move_uploaded_file($this->_filetmpname, $this->_filedir.$filename)){
            return $this->result();
        }else{
            $this->error(UPLOAD_FAILED);
            return '';
        }
    }

    function chk_ext(){
        if(empty($this->allowext) || in_array($this->get_fileext(), explode("|",$this->allowext))) return false;
        return true;
    }

    function chk_size(){
        if(empty($this->allowsize) || get_filesize <= $this->allowsize*1024*1024) return false;
        return true;
    }

    function get_filesize(){
        return $this->_filesize;
    }

    function get_fileext(){
        return substr($this->_filename,strrpos($this->_filename,".")+1);
    }

    function generate_name(){
        return substr(md5(time()),26);
    }

    function chk_hasfile(){
        return is_file($this->_filedir.$this->_filename);
    }

    function error($tip){
        echo $tip;
    }

    function result(){
        if($this->report){
            $filename = empty($this->newname) ? $this->_filename : $this->newname;
            $arr = array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);
            return $arr;
        }else{
            return UPLOAD_SUCCESS;
        }
    }
}

/***Instructions for use and parameters***/
/***
The first parameter $dir is the path where the uploaded file is stored
The second parameter is $_FILES which is your upload file variable
The third parameter allows file size in MB
The file type allowed by the fourth parameter is jpg|png|gif
Whether the fifth parameter needs to generate a new file name
The sixth parameter is the returned prompt format. 0 means direct prompt for correct upload. 1 returns an array array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);
***/

//require("类文件");
//$u = new file_uploader;
//$u->ready($dir, $_FILES['upload_file'], false, false, true, 0);
//echo $u->do_upload();

随便说下这个类怎样调用吧，方法很简单?

代码如下

代码如下	复制代码
$dir = 'upload/'; require("upload_class.php"); $u = new file_uploader; $u->ready($dir, $_FILES['upload_file'], false, false, true, 0); echo $u->do_upload();

复制代码

$dir = 'upload/'; require("upload_class.php"); $u = new file_uploader;

$u->ready($dir, $_FILES['upload_file'], false, false, true, 0);

echo $u->do_upload();

就像N年前那个染头发的广告说的那句，“得左！染黑头发就是这么简单！”一样，这里上传文件的操作也是“上传文件就这么简单！”。当然那个$_FILES['upload_file']是对应表单中的file类型的控件的名字。而需不需要在上传后输出提示就看你自己啦，关于参数在代码那里面有详细说明，不过这里也是放出来吧。?

ready方法的参数说明：

第一个参数$dir 为上传文件存放的路径第二个参数为$_FILES 为你那个上传文件变量第三个参数允许文件大小单位为MB 第四个参数允许的文件类型格式为jpg|png|gif 第五个参数是否需要生成新的文件名第六个参数为返回的提示格式 0为直接提示上传正确 1则返回一个数组array('filename' => 上传的文件名字, 'filesize' => 文件大小, 'tip' => 成功上传);? 很好！这样就完成了一篇文章，不过也花了不少时间呢……?

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