php教程

超轻量级php框架startmvc

PHP实现的文件上传类与用法详解

更新时间:2020-03-21 23:24:23 作者:startmvc
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.c

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
 static public function alertOpenerClose($_info,$_path) {
 echo "<script type='text/javascript'>alert('$_info');</script>";
 echo "<script type='text/javascript'>opener.document.content.thumbnail.value='$_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 target=_blank href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" rel="external nofollow" rel="external nofollow" >http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">
<html xmlns="<a target=_blank href="http://www.w3.org/1999/xhtml" rel="external nofollow" rel="external nofollow" >http://www.w3.org/1999/xhtml</a>">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>main</title>
 </head>
 <body>
 <form name="content" method="post" action="?action=add">
 <input type="text" name="thumbnail" class="text" readonly="readonly" /> <input type="button" value="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 target=_blank href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" rel="external nofollow" rel="external nofollow" >http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">
<html xmlns="<a target=_blank href="http://www.w3.org/1999/xhtml" rel="external nofollow" rel="external nofollow" >http://www.w3.org/1999/xhtml</a>">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>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!');
 }
?>

PHP 文件上传类