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                        /PHP實(shí)現(xiàn)文件上傳與下載

求助，我是按照視頻講解一步步敲打的代碼，怎么還是出錯(cuò)

1、upload.php頁面代碼
<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"?"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html?xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=gb2312"?/>
<title>無標(biāo)題文檔</title>
</head>

<body>
<form?action="doaction_new.php"?method="post"?enctype="multipart/form-data">
請選擇要上傳的文件：
<input?type="file"?name="myFile"/>
<input?type="submit"?value="上傳文件"/>
</form>
</body>
</html>

2、doaction_new.php頁面的代碼

<?php
header('content-type:text/html;charset=gb2312');
require_once?'upload.class.php';
//print_r($_FILES);exit;
$upload=new?upload();
$dest=$upload->uploadFile();
echo?$dest;
3、upload.class.php頁面的代碼
<?php
class?upload{
	protected?$fileName;
	protected?$maxSize;
	protected?$allowMime;
	protected?$allowExt;
	protected?$uploadPath;
	protected?$imgFlag;
	protected?$fileInfo;
	protected?$error;
	protected?$ext;
	
	public?function?__construct($fileName='myFile',$uploadPath='./uploads',$imgFlag=true,$maxSize=5242880,$allowExt=array('jpeg','jpg','png','gif','bmp'),$allowMime=array('image/pjpeg','image/jpeg','image/jpg','image/png','image/gif')){

		$this->fileName=$fileName;
		$this->maxSize=$maxSize;
		$this->allowMime=$allowMime;
		$this->allowExt=$allowExt;
		$this->uploadPath=$uploadPath;
		$this->imgFlag=$imgFlag;
		$this->fileInfo=$_FILES[$this->fileName];		
	}
	/**檢測上傳文件是否有錯(cuò)**/
	protected?function?checkError(){
		//var_dump($this->fileInfo);exit;
		//print_r($this->fileInfo);exit;
		if(!is_null($this->fileInfo)){
		if($this->fileInfo['error']>0){
		var_dump($this->fileInfo);exit;
		if($this->fileInfo['error']>0){
			switch($this->fileInfo['error']){
				case?1;
				???$this->error='超過了PHP配置文件中upload_max_filesize選項(xiàng)的值';
				???break;
				case?2;
				???$this->error='超過了表單中Max_file_size設(shè)置的值';
				???break;
				case?3;
				???$this->error='文件部分被上傳';
				???break;
				case?4;
				???$this->error='沒有選擇上傳文件';
				???break;
				case?6;
				???$this->error='沒有找到臨時(shí)目錄';
				???break;
				case?7;
				???$this->error='文件不可寫';
				???break;
				case?8;
				???$this->error='由于PHP的擴(kuò)展程序中斷上傳';
				???break;
		}
		return?false;
		}else{
			echo?aa;
		?????return?true;
		?????}
	???}else{
	?	$this->error='文件上傳出錯(cuò)';
	?	return?false;
?????}
	}
	
	/**檢查上傳文件的大小**/
	protected?function?checkSize(){
		if($this->fileInfo['size']>$this->maxSize){
			$this->error='上傳文件過大';
			return?false;
		}
		return?true;
	}
	/**檢測擴(kuò)展名**/
	protected?function?checkExt(){
		$this->ext=strtolower(pathinfo($this->fileInfo['name'],PATHINFO_EXTENSION));
		if(!in_array($this->ext,$this->allowExt)){
			$this->error='不允許的擴(kuò)展名';
			return?false;
		}
		return?true;
		}
		/**檢測文件的類型**/
	protected?function?checkMime(){
	????if(!in_array($this->fileInfo['type'],$this->allowMime)){
		$this->error='不允許的文件類型';
		return?false;
		}
		return?true;	
		}

		/**檢測是否是真實(shí)圖片**/
	protected?function?checkTrueImg(){
	????if($this->imgFlag){
			if(!@getimagesize($this->fileInfo['tmp_name'])){
			$this->error='不是真實(shí)的照片';
			return?false;
			}
			return?true;	
			}
	}
		/**檢測是否通過HTTPPost方式上傳**/
	protected?function?checkHTTPPost(){
	????if(!is_uploaded_file($this->fileInfo['tmp_name'])){
			$this->error='文件不是通過HTTPPost方式上傳的';
			return?false;
			}
			return?true;	
			}
		
	/**顯示錯(cuò)誤**/
	protected?function?showError(){
	??exit('<sapn?style="color:red">'.$this->error.'</span>');	
	}
	/**檢測目錄不存在則創(chuàng)建**/
	protected?function?checkUploadPath(){
		if(!file_exists($this->uploadPath)){
			mkdir($this->uploadPath,0777,true);
		}
	}
	/**產(chǎn)生唯一字符串當(dāng)做文件名**/
	protected?function?getUniName(){
		return?md5(uniqid(microtime(true),true));
	}
	/**上傳文件**/
	public?function?uploadFile(){
		if($this->checkError()&&$this->checkSize()&&$this->checkExt()&&$this->checkMime()&&$this->checkTrueImg()&&$this->checkHTTPPost()){
		$this->checkUploadPath();
		$this->uniName=$this->getUniName();
		$this->destination=$this->uploadPath.'/'.$this->uniName.'.'.$this->ext;
		if(@move_upload_file($this->fileInfo['tmp_name'],$this->destination)){
			return?$this->destination;
		}else{
				$this->error='文件移動(dòng)失敗';
				$this->showError();
			}
		}else{
			$this->showError();
	????}
	}
}