欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

php文件上传与下载(附封装好的函数文件)

程序员文章站 2022-05-29 07:58:28
单文件上传前端页面 Upload A File

单文件上传
前端页面

    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>upload a file</title>
    </head>
    <body>
        <form action="upload.php" method="post" enctype="multipart/form-data">
            <input type="hidden" name="max_file_size" value="1024000" />
            <input type="file" name="test_pic" />
            <input type="submit" value="上传" />
        </form>
    </body>
    </html>

后端实现upload.php

    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/11
     * time: 14:06
     */

    // 接收$_files数组
    $key = 'test_pic';
    $mimewhitelist = ['image/jpeg', 'image/png', 'image/gif'];//文件映射白名单
    $extwhitelist = ['jpeg', 'jpg', 'png', 'gif'];//文件扩展名白名单
    $allowsize = 2*1024*1024;
    $destdir = './uploads';

    $name = $_files[$key]['name']; // 源文件名称
    $type = $_files[$key]['type']; // mime 类型
    $tmpname = $_files[$key]['tmp_name']; // 临时文件名称
    $error = $_files[$key]['error']; // 错误信息
    $size = $_files[$key]['size']; // 文件大小 字节

    // 处理错误
    // 0 - 无错误
    if ($error > upload_err_ok) {
        switch($error) {
            // 1 - 文件大小超出了php.ini当中的upload_max_filesize的大小
            case upload_err_ini_size:
                exit('文件大小超出了php.ini当中的upload_max_filesize的大小');
            // 2 - 超出表单当中的max_file_size的大小
            case upload_err_form_size:
                exit('超出表单当中的max_file_size的大小');
            // 3 - 部分文件被上传
            case upload_err_partial:
                exit('部分文件被上传');
            // 4 - 没有文件被上传
            case upload_err_no_file:
                exit('没有文件被上传');
            // 6 - 临时目录不存在
            case upload_err_no_tmp_dir:
                exit('临时目录不存在');
            // 7 - 磁盘写入失败
            case upload_err_cant_write:
                exit('磁盘写入失败');
            // 8 - 文件上传被php扩展阻止
            case upload_err_extension:
                exit('文件上传被php扩展阻止');
            default:
                exit('未知错误');
        }
    }

    // 限制文件的mime
    if (!in_array($type, $mimewhitelist)) {
        exit('文件类型' . $type . '不被允许!');
    }

    // 限制文件的扩展名
    $ext = pathinfo($name, pathinfo_extension);
    if (!in_array($ext, $extwhitelist)) {
        exit('文件扩展名' . $ext . '不被允许!');
    }

    // 限制文件大小
    if ($size > $allowsize) {
        exit('文件大小 ' . $size . ' 超出限定大小 ' . $allowsize . ' !');
    }

    // 生成新的随机文件名称
    // md5(rand());
    $filename = uniqid() . '.' . $ext;

    // 移动临时文件到指定目录当中并重新命名文件名
    if (!file_exists($destdir)) {
        mkdir($destdir, 0777, true);
    }
    if (is_uploaded_file($tmpname) && move_uploaded_file($tmpname, $destdir . '/' . $filename)) {
        echo "恭喜,文件上传成功";
    } else {
        echo "很抱歉,文件上传失败";
    }

多文件上传,指定文件数量
前端页面

    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>upload multiple files</title>
    </head>
    <body>
    <form action="multiple_upload.php" method="post" enctype="multipart/form-data">
        <input type="hidden" name="max_file_size" value="1024000" />
        <input type="file" name="test_pic1" />
        <input type="file" name="test_pic2" />
        <input type="file" name="test_pic3" />
        <input type="submit" value="上传" />
    </form>
    </body>
    </html>

后端实现multiple_upload.php

    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/11
     * time: 14:54
     */

    $errors = [];
    $mimewhitelist = ['image/jpeg', 'image/png', 'image/gif'];
    $extwhitelist = ['jpeg', 'jpg', 'png', 'gif'];
    $allowsize = 2*1024*1024;
    $destdir = './uploads';

    foreach($_files as $key => $val) {
        // name type tmp_name error size
        // 接收$_files
        $name = $_files[$key]['name']; // 源文件名称
        $type = $_files[$key]['type']; // mime 类型
        $tmpname = $_files[$key]['tmp_name']; // 临时文件名称
        $error = $_files[$key]['error']; // 错误信息
        $size = $_files[$key]['size']; // 文件大小 字节

        // 处理错误
        // 0 - 无错误
        if ($error > upload_err_ok) {
            switch($error) {
                // 1 - 文件大小超出了php.ini当中的upload_max_filesize的大小
                case upload_err_ini_size:
                    $errors[$key] = '文件大小超出了php.ini当中的upload_max_filesize的大小';
                    continue 2;
                // 2 - 超出表单当中的max_file_size的大小
                case upload_err_form_size:
                    $errors[$key] = '超出表单当中的max_file_size的大小';
                    continue 2;
                // 3 - 部分文件被上传
                case upload_err_partial:
                    $errors[$key] = '部分文件被上传';
                    continue 2;
                // 4 - 没有文件被上传
                case upload_err_no_file:
                    $errors[$key] = '没有文件被上传';
                    continue 2;
                // 6 - 临时目录不存在
                case upload_err_no_tmp_dir:
                    $errors[$key] = '临时目录不存在';
                    continue 2;
                // 7 - 磁盘写入失败
                case upload_err_cant_write:
                    $errors[$key] = '磁盘写入失败';
                    continue 2;
                // 8 - 文件上传被php扩展阻止
                case upload_err_extension:
                    $errors[$key] = '文件上传被php扩展阻止';
                    continue 2;
                default:
                    $errors[$key] = '未知错误';
                    continue 2;
            }
        }

        // 限制mime
        if (!in_array($type, $mimewhitelist)) {
            $errors[$key] = '文件类型' . $type . '不被允许!';
            continue;
        }

        // 限制扩展名
        $ext = pathinfo($name, pathinfo_extension);
        if (!in_array($ext, $extwhitelist)) {
            $errors[$key] = '文件扩展名' . $ext . '不被允许!';
            continue;
        }

        // 限制大小
        if ($size > $allowsize) {
            $errors[$key] = '文件大小 ' . $size . ' 超出限定大小 ' . $allowsize . ' !';
            continue;
        }

        // 生成随机文件名称
        $filename = uniqid() . '.' . $ext;

        // 移动文件
        if (!file_exists($destdir)) {
            mkdir($destdir, 0777, true);
        }
        if (!is_uploaded_file($tmpname) || !move_uploaded_file($tmpname, $destdir . '/' . $filename)) {
            $errors[$key] = "很抱歉,文件上传失败";
            continue;
        }
    }

    if (count($errors) > 0) {
        var_dump($errors);
    } else {
        echo "文件全部上传成功";
    }

多文件上传,不定文件数量
前端页面

    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>upload multiple files</title>
    </head>
    <body>
    <form action="multiple_upload2.php" method="post" enctype="multipart/form-data">
        <input type="hidden" name="max_file_size" value="6024000" />
        <input type="file" name="test_pic[]" />
        <input type="file" name="test_pic[]" />
        <input type="file" name="test_pic[]" />
        <input type="submit" value="上传" />
    </form>
    </body>
    </html>

后端实现multiple_upload2.php

    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/11
     * time: 15:12
     */

    $key = 'test_pic';
    $mimewhitelist = ['image/jpeg', 'image/png', 'image/gif'];
    $extwhitelist = ['jpeg', 'jpg', 'png', 'gif'];
    $allowsize = 2*1024*1024;
    $destdir = './uploads';

    // 接收和处理$_files
    if (!empty($_files[$key])) {
        $files = [];
        foreach($_files[$key]['name'] as $k => $v) {
            $files[$k]['name'] = $v;
            $files[$k]['type'] = $_files[$key]['type'][$k];
            $files[$k]['tmp_name'] = $_files[$key]['tmp_name'][$k];
            $files[$k]['error'] = $_files[$key]['error'][$k];
            $files[$k]['size'] = $_files[$key]['size'][$k];
        }
    }

    $errors = [];
    foreach($files as $file) {
        // name type error size
        $name = $file['name']; // 源文件名称
        $type = $file['type']; // mime 类型
        $tmpname = $file['tmp_name']; // 临时文件名称
        $error = $file['error']; // 错误信息
        $size = $file['size']; // 文件大小 字节

        // 处理错误
        // 0 - 无错误
        if ($error > upload_err_ok) {
            switch($error) {
                // 1 - 文件大小超出了php.ini当中的upload_max_filesize的大小
                case upload_err_ini_size:
                    $errors[$key] = $name . '文件大小超出了php.ini当中的upload_max_filesize的大小';
                    continue 2;
                // 2 - 超出表单当中的max_file_size的大小
                case upload_err_form_size:
                    $errors[$key] =  $name . '超出表单当中的max_file_size的大小';
                    continue 2;
                // 3 - 部分文件被上传
                case upload_err_partial:
                    $errors[$key] = $name . '部分文件被上传';
                    continue 2;
                // 4 - 没有文件被上传
                case upload_err_no_file:
                    $errors[$key] = $name . '没有文件被上传';
                    continue 2;
                // 6 - 临时目录不存在
                case upload_err_no_tmp_dir:
                    $errors[$key] = $name . '临时目录不存在';
                    continue 2;
                // 7 - 磁盘写入失败
                case upload_err_cant_write:
                    $errors[$key] = $name . '磁盘写入失败';
                    continue 2;
                // 8 - 文件上传被php扩展阻止
                case upload_err_extension:
                    $errors[$key] = $name . '文件上传被php扩展阻止';
                    continue 2;
                default:
                    $errors[$key] = $name . '未知错误';
                    continue 2;
            }
        }

        // 限制mime类型
        if (!in_array($type, $mimewhitelist)) {
            $errors[$key] = '文件类型' . $type . '不被允许!';
            continue;
        }

        // 限制扩展名
        $ext = pathinfo($name, pathinfo_extension);
        if (!in_array($ext, $extwhitelist)) {
            $errors[$key] = '文件扩展名' . $ext . '不被允许!';
            continue;
        }

        // 限制文件大小
        if ($size > $allowsize) {
            $errors[$key] = '文件大小 ' . $size . ' 超出限定大小 ' . $allowsize . ' !';
            continue;
        }

        // 生成随机文件名称
        $filename = uniqid() . '.' . $ext;

        // 移动文件
        if (!file_exists($destdir)) {
            mkdir($destdir, 0777, true);
        }
        if (!is_uploaded_file($tmpname) || !move_uploaded_file($tmpname, $destdir . '/' . $filename)) {
            $errors[$key] = "很抱歉,文件上传失败";
            continue;
        }
    }

    if (count($errors) > 0) {
        var_dump($errors);
    } else {
        echo "文件全部上传成功";
    }

文件上传类封装 uploadfile.php
支持多文件或者单文件

    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/11
     * time: 22:01
     */

    class uploadfile
    {

        /**
         *
         */
        const upload_error = [
            upload_err_ini_size => '文件大小超出了php.ini当中的upload_max_filesize的值',
            upload_err_form_size => '文件大小超出了max_file_size的值',
            upload_err_partial => '文件只有部分被上传',
            upload_err_no_file => '没有文件被上传',
            upload_err_no_tmp_dir => '找不到临时目录',
            upload_err_cant_write => '写入磁盘失败',
            upload_err_extension => '文件上传被扩展阻止',
        ];

        /**
         * @var
         */
        protected $field_name;

        /**
         * @var string
         */
        protected $destination_dir;

        /**
         * @var array
         */
        protected $allow_mime;

        /**
         * @var array
         */
        protected $allow_ext;

        /**
         * @var
         */
        protected $file_org_name;

        /**
         * @var
         */
        protected $file_type;

        /**
         * @var
         */
        protected $file_tmp_name;

        /**
         * @var
         */
        protected $file_error;

        /**
         * @var
         */
        protected $file_size;

        /**
         * @var array
         */
        protected $errors;

        /**
         * @var
         */
        protected $extension;

        /**
         * @var
         */
        protected $file_new_name;

        /**
         * @var float|int
         */
        protected $allow_size;

        /**
         * uploadfile constructor.
         * @param $keyname
         * @param string $destinationdir
         * @param array $allowmime
         * @param array $allowext
         * @param float|int $allowsize
         */
        public function __construct($keyname, $destinationdir = './uploads', $allowmime = ['image/jpeg', 'image/gif'], $allowext = ['gif', 'jpeg'], $allowsize = 2*1024*1024)
        {
            $this->field_name = $keyname;
            $this->destination_dir = $destinationdir;
            $this->allow_mime = $allowmime;
            $this->allow_ext = $allowext;
            $this->allow_size = $allowsize;
        }

        /**
         * @param $destinationdir
         */
        public function setdestinationdir($destinationdir)
        {
            $this->destination_dir = $destinationdir;
        }

        /**
         * @param $allowmime
         */
        public function setallowmime($allowmime)
        {
            $this->allow_mime = $allowmime;
        }

        /**
         * @param $allowext
         */
        public function setallowext($allowext)
        {
            $this->allow_ext = $allowext;
        }

        /**
         * @param $allowsize
         */
        public function setallowsize($allowsize)
        {
            $this->allow_size = $allowsize;
        }

        /**
         * @return bool
         */
        public function upload()
        {
            // 判断是否为多文件上传
            $files = [];
            if (is_array($_files[$this->field_name]['name'])) {
                foreach($_files[$this->field_name]['name'] as $k => $v) {
                    $files[$k]['name'] = $v;
                    $files[$k]['type'] = $_files[$this->field_name]['type'][$k];
                    $files[$k]['tmp_name'] = $_files[$this->field_name]['tmp_name'][$k];
                    $files[$k]['error'] = $_files[$this->field_name]['error'][$k];
                    $files[$k]['size'] = $_files[$this->field_name]['size'][$k];
                }
            } else {
                $files[] = $_files[$this->field_name];
            }

            foreach($files as $key => $file) {
                // 接收$_files参数
                $this->setfileinfo($key, $file);

                // 检查错误
                $this->checkerror($key);

                // 检查mime类型
                $this->checkmime($key);

                // 检查扩展名
                $this->checkext($key);

                // 检查文件大小
                $this->checksize($key);

                // 生成新的文件名称
                $this->generatenewname($key);

                if (count((array)$this->geterror($key)) > 0) {
                    continue;
                }
                // 移动文件
                $this->movefile($key);
            }
            if (count((array)$this->errors) > 0) {
                return false;
            }
            return true;
        }

        /**
         * @return array
         */
        public function geterrors()
        {
            return $this->errors;
        }

        /**
         * @param $key
         * @return mixed
         */
        protected function geterror($key)
        {
            return $this->errors[$key];
        }

        /**
         *
         */
        protected function setfileinfo($key, $file)
        {
            // $_files  name type temp_name error size
            $this->file_org_name[$key] = $file['name'];
            $this->file_type[$key] = $file['type'];
            $this->file_tmp_name[$key] = $file['tmp_name'];
            $this->file_error[$key] = $file['error'];
            $this->file_size[$key] = $file['size'];
        }


        /**
         * @param $key
         * @param $error
         */
        protected function seterror($key, $error)
        {
            $this->errors[$key][] = $error;
        }


        /**
         * @param $key
         * @return bool
         */
        protected function checkerror($key)
        {
            if ($this->file_error > upload_err_ok) {
                switch($this->file_error) {
                    case upload_err_ini_size:
                    case upload_err_form_size:
                    case upload_err_partial:
                    case upload_err_no_file:
                    case upload_err_no_tmp_dir:
                    case upload_err_cant_write:
                    case upload_err_extension:
                        $this->seterror($key, self::upload_error[$this->file_error]);
                        return false;
                }
            }
            return true;
        }


        /**
         * @param $key
         * @return bool
         */
        protected function checkmime($key)
        {
            if (!in_array($this->file_type[$key], $this->allow_mime)) {
                $this->seterror($key, '文件类型' . $this->file_type[$key] . '不被允许!');
                return false;
            }
            return true;
        }


        /**
         * @param $key
         * @return bool
         */
        protected function checkext($key)
        {
            $this->extension[$key] = pathinfo($this->file_org_name[$key], pathinfo_extension);
            if (!in_array($this->extension[$key], $this->allow_ext)) {
                $this->seterror($key, '文件扩展名' . $this->extension[$key] . '不被允许!');
                return false;
            }
            return true;
        }

        /**
         * @return bool
         */
        protected function checksize($key)
        {
            if ($this->file_size[$key] > $this->allow_size) {
                $this->seterror($key, '文件大小' . $this->file_size[$key] . '超出了限定大小' . $this->allow_size);
                return false;
            }
            return true;
        }


        /**
         * @param $key
         */
        protected function generatenewname($key)
        {
            $this->file_new_name[$key] = uniqid() . '.' . $this->extension[$key];
        }


        /**
         * @param $key
         * @return bool
         */
        protected function movefile($key)
        {
            if (!file_exists($this->destination_dir)) {
                mkdir($this->destination_dir, 0777, true);
            }
            $newname = rtrim($this->destination_dir, '/') . '/' . $this->file_new_name[$key];
            if (is_uploaded_file($this->file_tmp_name[$key]) && move_uploaded_file($this->file_tmp_name[$key], $newname)) {
                return true;
            }
            $this->seterror($key, '上传失败!');
            return false;
        }

        /**
         * @return mixed
         */
        public function getfilename()
        {
            return $this->file_new_name;
        }

        /**
         * @return string
         */
        public function getdestinationdir()
        {
            return $this->destination_dir;
        }

        /**
         * @return mixed
         */
        public function getextension()
        {
            return $this->extension;
        }

        /**
         * @return mixed
         */
        public function getfilesize()
        {
            return $this->file_size;
        }

    }

前端页面演示

    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>test upload class</title>
    </head>
    <body>
        <form action="testuploadfile.php" method="post" enctype="multipart/form-data">
            <input type="hidden" name="max_file_size" value="10240000" />
            <input type="file" name="test_pic[]" multiple="multiple"/>
            <input type="submit" value="上传" />
        </form>
    </body>
    </html>

后端配置演示testuploadfile.php 

    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/11
     * time: 22:46
     */
    require('uploadfile.php');

    $upload = new uploadfile('test_pic');
    $upload->setdestinationdir('./uploads');
    $upload->setallowmime(['image/jpeg', 'image/gif']);
    $upload->setallowext(['gif', 'jpeg']);
    $upload->setallowsize(2*1024*1024);
    if ($upload->upload()) {
        var_dump($upload->getfilename());
        var_dump($upload->getdestinationdir());
        var_dump($upload->getextension());
        var_dump($upload->getfilesize());
    } else {
        var_dump($upload->geterrors());
    }

文件下载
    <?php
    /**
     * created by phpstorm.
     * date: 2018/11/12
     * time: 00:07
     */
    //演示
    //echo '<a href="./uploads/test.jpg">下载图片</a>';

    // download.php?file=5be822d84c42a.jpeg

    // 接收get参数
    if (!isset($_get['file'])) {
        exit('需要传递文件名称');
    }

    if (empty($_get['file'])) {
        exit('请传递文件名称');
    }

    // 获取远程文件地址
    $file = './uploads/' . $_get['file'];

    if (!file_exists($file)) {
        exit('文件不存在');
    }

    if (!is_file($file)) {
        exit('文件不存在');
    }

    if (!is_readable($file)) {
        exit('文件不可读');
    }

    // 清空缓冲区
    ob_clean();

    // 打开文件 rb
    $file_handle = fopen($file, 'rb');

    if (!$file_handle) {
        exit('打开文件失败');
    }

    // 通知浏览器
    header('content-type: application/octet-stream; charset=utf-8');
    header('content-transfer-encoding: binary');
    header('content-length: ' . filesize($file));
    header('content-disposition: attachment; filename="' . urlencode(basename($file)) . '"');

    // 读取并输出文件
    while(!feof($file_handle)) {
        echo fread($file_handle, 10240);
    }

    // 关闭文档流
    fclose($file_handle);