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
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<?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！');
}
?>
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》
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