php文件上传与下载（附封装好的函数文件）

发布时间：2020-12-13 20:55:18 所属栏目：PHP教程来源：网络整理

导读：单文件上传前端页面 ! DOCTYPE html html lang ="en" head meta charset ="UTF-8" title Upload A File / body form action ="upload.php" method ="post" enctype ="multipart/form-data" input type ="hidden" name ="MAX_FILE_SIZE" value ="1024000" /

单文件上传
前端页面

    <!DOCTYPE html>
    <html lang="en"head>
        meta charset="UTF-8"title>Upload A File</bodyform action="upload.php" method="post" enctype="multipart/form-data">
            input type="hidden" name="MAX_FILE_SIZE" value="1024000" />
            ="file"="test_pic" ="submit"="上传" />
        formhtml>

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 = $key]['type'];  MIME 类型
    $tmpName = $key]['tmp_name'];  临时文件名称
    $error = $key]['error'];  错误信息
    $size = $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);
    $ext,1)">$extWhiteListexit('文件扩展名' . $ext . '不被允许！' 限制文件大小
    $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
    file_exists($destDirmkdir($destDir,0777,1)">true);
    }
    if (is_uploaded_file($tmpName) && move_uploaded_file($tmpName,1)">$destDir . '/' . $fileNameecho "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

    >Upload Multiple Files="multiple_upload.php"="test_pic1" ="test_pic2" ="test_pic3" />
    >

后端实现multiple_upload.php

    <?*
     * Created by PhpStorm.
     * Date: 2018/11/11
     * Time: 14:54
     */

    $errors = [];
    ];
    foreach($_FILES as $key => $val name type tmp_name error size
        // 接收$_FILES
         源文件名称
         MIME 类型
         临时文件名称
         错误信息
         文件大小 字节

        // 处理错误
        // 0 - 无错误
         UPLOAD_ERR_OK) {
            ) {
                 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:
                    $key] = '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:
                    $key] = '部分文件被上传' 4 - 没有文件被上传
                case UPLOAD_ERR_NO_FILE:
                    $key] = '没有文件被上传' 6 - 临时目录不存在
                case UPLOAD_ERR_NO_TMP_DIR:
                    $key] = '临时目录不存在' 7 - 磁盘写入失败
                case UPLOAD_ERR_CANT_WRITE:
                    $key] = '磁盘写入失败' 8 - 文件上传被PHP扩展阻止
                case UPLOAD_ERR_EXTENSION:
                    $key] = '文件上传被PHP扩展阻止'default:
                    $key] = '未知错误';
            }
        }

         限制MIME
        )) {
            $key] = '文件类型' . ;
            continue;
        }

         限制扩展名
         PATHINFO_EXTENSION);
        $key] = '文件扩展名' .  限制大小
        ) {
            $key] = '文件大小 ' .  生成随机文件名称
        ;

         移动文件
        )) {
            );
        }
        $tmpName) || !$key] = "很抱歉，文件上传失败";
        }
    }

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

多文件上传，不定文件数量
前端页面

    ="multiple_upload2.php"="6024000" ="test_pic[]" >

后端实现multiple_upload2.php

    <?*
     * Created by PhpStorm.
     * Date: 2018/11/11
     * Time: 15:12
      接收和处理$_FILES
    empty($key])) {
        $files = [];
        $key]['name'] $k => $v$files[$k]['name'] = ;
            $k]['type'] = $key]['type'][$k];
            $k]['tmp_name'] = $key]['tmp_name'][$k]['error'] = $key]['error'][$k]['size'] = $key]['size'][];
        }
    }

     [];
    $files $file name type error size
        $file['name']; $file['type']; $file['tmp_name']; $file['error']; $file['size']; $key] = $name . '文件大小超出了php.ini当中的upload_max_filesize的大小'$key] =  $name . '超出表单当中的MAX_FILE_SIZE的大小'$name . '部分文件被上传'$name . '没有文件被上传'$name . '临时目录不存在'$name . '磁盘写入失败'$name . '文件上传被PHP扩展阻止'$name . '未知错误' 限制MIME类型
         限制文件大小
        ;
    }

文件上传类封装 UploadFile.php
支持多文件或者单文件

    <?*
     * 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',1)">
            UPLOAD_ERR_FORM_SIZE => '文件大小超出了MAX_FILE_SIZE的值',1)">
            UPLOAD_ERR_PARTIAL => '文件只有部分被上传',1)">
            UPLOAD_ERR_NO_FILE => '没有文件被上传',1)">
            UPLOAD_ERR_NO_TMP_DIR => '找不到临时目录',1)">
            UPLOAD_ERR_CANT_WRITE => '写入磁盘失败',1)">
            UPLOAD_ERR_EXTENSION => '文件上传被扩展阻止',1)">
        ];

        *
         * @var
         protected $field_name*
         * @var string
         $destination_dir*
         * @var array
         $allow_mime$allow_ext$file_org_name$file_type$file_tmp_name$file_error$file_size$extension$file_new_name*
         * @var float|int
         $allow_size*
         * UploadFile constructor.
         * @param $keyName
         * @param string $destinationDir
         * @param array $allowMime
         * @param array $allowExt
         * @param float|int $allowSize
         public function __construct($keyName,1)">$destinationDir = './uploads',1)">$allowMime = ['image/jpeg','image/gif'],1)">$allowExt = ['gif','jpeg'],1)">)
        {
            $this->field_name = $keyName$this->destination_dir = $destinationDir$this->allow_mime = $allowMime$this->allow_ext = $allowExt$this->allow_size = *
         * @param $destinationDir
         function setDestinationDir(*
         * @param $allowMime
         function setAllowMime(*
         * @param $allowExt
         function setAllowExt(*
         * @param $allowSize
         function setAllowSize(*
         * @return bool
         function upload()
        {
             判断是否为多文件上传
             [];
            is_array($this->field_name]['name'])) {
                $this->field_name]['name'] ) {
                    ;
                    $this->field_name]['type'][];
                    $this->field_name]['tmp_name'][$this->field_name]['error'][$this->field_name]['size'][];
                }
            }  {
                $files[] = $this->field_name];
            }

             接收$_FILES参数
                $this->setFileInfo($key,1)">);

                 检查错误
                $this->checkError( 检查MIME类型
                $this->checkMime( 检查扩展名
                $this->checkExt( 检查文件大小
                $this->checkSize( 生成新的文件名称
                $this->generateNewName(count((array)$this->getError($key)) > 0) {
                    ;
                }
                 移动文件
                $this->moveFile();
            }
            $this->errors) > 0return false;
            }
            *
         * @return array
          getErrors()
        {
            return errors;
        }

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

        function setFileInfo( $_FILES  name type temp_name error size
            $this->file_org_name[$file['name'$this->file_type[$file['type'$this->file_tmp_name[$file['tmp_name'$this->file_error[$file['error'$this->file_size[$file['size'];
        }


        *
         * @param $key
         * @param $error
         function setError($key][] = ;
        }


        *
         * @param $key
         * @return bool
         function checkError($this->file_error > UPLOAD_ERR_OK) {
                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:
                        $this->setError(file_error]);
                        ;
                }
            }
            function checkMime($key],1)">allow_mime)) {
                $key] . '不被允许!');
                function checkExt($this->extension[$key] =  PATHINFO_EXTENSION);
            allow_ext)) {
                $key] . '不被允许！'function checkSize($key] > allow_size) {
                $key] . '超出了限定大小' . allow_size);
                *
         * @param $key
         function generateNewName($this->file_new_name[function moveFile(destination_dir)) {
                $this->destination_dir,1)">);
            }
            $newName = rtrim(];
            $key]) && $newName)) {
                ;
            }
            *
         * @return mixed
          getFileName()
        {
            file_new_name;
        }

        *
         * @return string
          getDestinationDir()
        {
            destination_dir;
        }

         getExtension()
        {
            extension;
        }

         getFileSize()
        {
            file_size;
        }

    }

前端页面演示

    >Test Upload Class="TestUploadFile.php"="10240000" ="test_pic[]" multiple="multiple">

后端配置演示TestUploadFile.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',1)">]);
    $upload->setAllowExt(['gif','jpeg'$upload->setAllowSize(2*1024*1024);
    $upload->upload()) {
        getFileName());
        getDestinationDir());
        getExtension());
        getFileSize());
    } getErrors());
    }

文件下载
    <?*
     * 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
    isset($_GET['file'])) {
        exit('需要传递文件名称'exit('请传递文件名称' 获取远程文件地址
    $file = './uploads/' . ];

    exit('文件不存在'is_file(is_readable(exit('文件不可读' 清空缓冲区
    ob_clean();

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

    if (!$file_handleexit('打开文件失败' 通知浏览器
    header('Content-type: application/octet-stream; charset=utf-8'header('Content-Transfer-Encoding: binary'header('Content-Length: ' . filesize());
    header('Content-Disposition: attachment; filename="' . urlencode(basename($file)) . '"' 读取并输出文件
    while(!feof(echo fread($file_handle,10240 关闭文档流
    fclose($file_handle);

（编辑：李大同）

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