PHP实现的文件上传类与用法详解

2018-09-07 13:59

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  本文实例讲述了PHP实现的文件上传类与用法。分享给大家供大家参考,具体如下:

  FileUpload.class.php,其中用到了两个常量,可在网站配置文件中定义:define(ROOT_PATH,dirname(__FILE__)); //网站根目录、define(UPDIR,/uploads/); //上传主目录

   <?php //上传文件类 class FileUpload { private $error; //错误代码 private $maxsize; //表单最大值 private $type; //类型 private $typeArr = array(image/jpeg,image/pjpeg,image/png,image/x-png,image/gif); //类型合集 private $path; //目录路径 private $today; //今天目录 private $name; //文件名 private $tmp; //临时文件 private $linkpath; //链接路径 private $linktotay; //今天目录(相对) //构造方法,初始化 public function __construct($_file,$_maxsize) { $this->error = $_FILES[$_file][error]; $this->maxsize = $_maxsize / 1024; $this->type = $_FILES[$_file][type]; $this->path = ROOT_PATH.UPDIR; $this->linktotay = date(Ymd)./; $this->today = $this->path.$this->linktotay; $this->name = $_FILES[$_file][name]; $this->tmp = $_FILES[$_file][tmp_name]; $this->checkError(); $this->checkType(); $this->checkPath(); $this->moveUpload(); } //返回路径 public function getPath() { $_path = $_SERVER[SCRIPT_NAME]; $_dir = dirname(dirname($_path)); if ($_dir == \\) $_dir = /; $this->linkpath = $_dir.$this->linkpath; return $this->linkpath; } //移动文件 private function moveUpload() { if (is_uploaded_file($this->tmp)) { if (!move_uploaded_file($this->tmp,$this->setNewName())) { Tool::alertBack(警告:上传失败!); } } else { Tool::alertBack(警告:临时文件不存在!); } } //设置新文件名 private function setNewName() { $_nameArr = explode(.,$this->name); $_postfix = $_nameArr[count($_nameArr)-1]; $_newname = date(YmdHis).mt_rand(100,1000)...$_postfix; $this->linkpath = UPDIR.$this->linktotay.$_newname; return $this->today.$_newname; } //验证目录 private function checkPath() { if (!is_dir($this->path) !is_writeable($this->path)) { if (!mkdir($this->path)) { Tool::alertBack(警告:主目录创建失败!); } } if (!is_dir($this->today) !is_writeable($this->today)) { if (!mkdir($this->today)) { Tool::alertBack(警告:子目录创建失败!); } } } //验证类型 private function checkType() { if (!in_array($this->type,$this->typeArr)) { Tool::alertBack(警告:不合法的上传类型!); } } //验证错误 private function checkError() { if (!empty($this->error)) { switch ($this->error) { case 1 : Tool::alertBack(警告:上传值超过了约定最大值!); break; case 2 : Tool::alertBack(警告:上传值超过了.$this->maxsize.KB!); break; case 3 : Tool::alertBack(警告:只有部分文件被上传!); break; case 4 : Tool::alertBack(警告:没有任何文件被上传!); break; default: Tool::alertBack(警告:未知错误!); } } } } ?>

  其中,用到了一个静态工具类 Tool.class.php,代码如下:

  Tool.class.php

   <?php class Tool { //弹窗返回 static public function alertBack($_info) { echo <script type=text/javascript>alert($_info);history.back();</script>; exit(); } //弹窗赋值关闭tent.thumbnail.value=$_path;</script>; echo <script type=text/javascript>opener.document.content.pic.style.display=block;</script>; echo <script type=text/javascript>opener.document.content.pic.src=$_path;</script>; echo <script type=text/javascript>window.close();</script>; exit(); } } ?>

  下面进行一个实例演示,请看下面的步骤:

  1、先创建一个 index.php 页面,做一个表单

  index.php

   <!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN <a href=上传 onclick=centerWindow(./upfile.html,upfile,400,100) /> <img name=pic style=display:none; /> ( * 必须是jpg,gif,png,并且200k内) <br /> </form> </body> </html>

  2、创建 upfile.html 文件,建立表单提交到 upload.php.

  upfile.html

   <!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN <a href=上传图片</title> </head> <body></p><p> <form method=post action=./upload.php enctype=multipart/form-data style=text-align:center;margin:30px;> <input type=hidden name=MAX_FILE_SIZE value=204800 /> <input type=file name=pic /> <input type=submit name=send value=确定上传 /> </form></p><p></body> </html>

  3、通过 upload.php 文件调用文件上传类实现上传,并且把路径赋给 input 标签和显示图片

   <?php require FileUpload.class.php; if (isset($_POST[send])) { $_fileupload = new FileUpload(pic,$_POST[MAX_FILE_SIZE]); $_path = $_fileupload->getPath(); Tool::alertOpenerClose(文件上传成功!,$_path); } else { Tool::alertBack(警告:文件过大或者其他未知错误导致浏览器崩溃!); } ?>

  更多关于PHP相关内容感兴趣的读者可查看本站专题:《php文件操作总结》、《PHP数组(Array)操作技巧大全》、《PHP基本语法入门教程》、《php面向对象程序设计入门教程》、《PHP网络编程技巧总结》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

  希望本文所述对大家PHP程序设计有所帮助。


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