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！');
}
?>
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希望本文所述对大家PHP程序设计有所帮助。