高质量缩略图生成

[email=*@author]*@author[/email]
：swin.wang  Email:
[email protected]
[email=*@update]*@update[/email]
:  sunbeam   Email:
[email protected]
*/
class ieb_upload{

/**
  * 表单中 文件框名称
  * @var string
  */
var $FileName = "";

/**
  * 上传目录
  * @var string
  */
var $Directroy = "";

/**
  * 最大文件大小
  * @var int
  */
var $MaxSize = 2097152;

/**
  * 是否可以上传
  * @var bool
  */
var $CanUpload = true;

/**
  * 上传文件名
  * @var string
  */
var $doUpFile = '';

/**
  * 缩略图名
  * @var string
  */
var $sm_File = '';

/**
  * 异常号
  * @var int
  */
var $Error = 0;

/**
* 构造函数
*
* @param  string  $FileName
* @param  string  $dirPath
* @param  int  $maxSize
* @return  null
*/
function ieb_upload($FileName='', $dirPath='', $maxSize=2097152) //(1024*2)*1024=2097152 就是 2M
{
  //global $FileName, $Directroy, $MaxSize, $CanUpload, $Error, $doUpFile, $sm_File;
  //初始化各种参数
  $this->FileName = $FileName;
  $this->MaxSize = $maxSize;
  
  if ($FileName == ''){
   $this->CanUpload = false;
   $this->Error = 1;
   break;
  }
  
  if ($dirPath != ''){
   $this->Directroy = $dirPath;
  }else{
   $this->Directroy = './';
  }
}

/**
  * 检查文件是否存在
  *
  * @return bool
  */
function scanFile()
{  
  if ($this->CanUpload){
   $scan = is_readable($_FILES[$this->FileName]['name']);  
   if ($scan){   
    $Error = 2;
   }  
   return $scan;
  }
}

/**
  * 获取文件大小
  *
  * @return int
  */
function getSize($format = 'B')
{
  
  if ($this->CanUpload){  
   if ($_FILES[$this->FileName]['size'] == 0){
    $this->Error = 3;
    $this->CanUpload = false;
   }  
   switch ($format){
    case 'B':
    return $_FILES[$this->FileName]['size'];
    break;
   
    case 'M':
    return ($_FILES[$this->FileName]['size'])/(1024*1024);
   }  
  }
}

/**
  * 获取文件类型
  *
  * @return string
  */
function getExt()
{
  if ($this->CanUpload){
   $ext=$_FILES[$this->FileName]['name'];
   $extStr=explode('.',$ext);
   $count=count($extStr)-1;
  }
  return $extStr[$count];
}


/**
  * 获取文件名称
  *
  * @return string
  */
function getName()
{
  if ($this->CanUpload){
   return $_FILES[$this->FileName]['name'];
  }
}

/**
  * 新建文件名
  *
  * @return string
  */
function newName()
{  
  if ($this->CanUpload){
   $FullName=$_FILES[$this->FileName]['name'];
   $extStr=explode('.',$FullName);
   $count=count($extStr)-1;
   $ext = $extStr[$count];
   
   return date('YmdHis').rand(0,9).'.'.$ext;
  }
}


/**
  * 上传文件，失败时返回异常类型号
  *
  * @param   string   $fileName
  * @return   
  */
function upload($fileName = '')
{  
  if ($this->CanUpload){
   if ($_FILES[$this->FileName]['size'] == 0){
    $this->Error = 3;
    $this->CanUpload = false;
    return $this->Error;
    break;
   }
  }
  
  if($this->CanUpload){
   if ($fileName == ''){
    $fileName = $_FILES[$this->FileName]['name'];
   }  
   $this->doUpload=@copy($_FILES[$this->FileName]['tmp_name'], $this->Directroy.$fileName);  
   if($this->doUpload)
   {
    $this->doUpFile = $fileName;
    chmod($this->Directroy.$fileName, 0777);
    return true;
   }else{
    $this->Error = 4;
    return $this->Error;
   }
  }
}

/**
  * 创建图片缩略图,成功返回真，否则返回错误类型号
  *
  * @param string $dscChar   前缀
  * @param int $width    缩略图宽
  * @param int $height   缩略图高
  * @return
  */
function thumb($dscChar='',$width=160,$height=120)
{  
  if ($this->CanUpload && $this->doUpFile != ''){
   $srcFile = $this->doUpFile;
   
   if ($dscChar == ''){
    $dscChar = 'sm_';
   }
   
   $dscFile = $this->Directroy.$dscChar.$srcFile;
   $data = getimagesize($this->Directroy.$srcFile,&$info);
   
   switch ($data[2]) {
    case 1:
    $im = @imagecreatefromgif($this->Directroy.$srcFile);
    break;
   
    case 2:
    $im = @imagecreatefromjpeg($this->Directroy.$srcFile);
    break;
   
    case 3:
    $im = @imagecreatefrompng($this->Directroy.$srcFile);
    break;
   }
   
   $srcW=imagesx($im);
   $srcH=imagesy($im);
   
   if(($srcW/$width)>=($srcH/$height)){
    $temp_height=$height;
    $temp_width=$srcW/($srcH/$height);
    $src_X=abs(($width-$temp_width)/2);
    $src_Y=0;
   }
   else{
    $temp_width=$width;
    $temp_height=$srcH/($srcW/$width);
    $src_X=0;
    $src_Y=abs(($height-$temp_height)/2);
   }
   $temp_img=imagecreatetruecolor($temp_width,$temp_height);
   imagecopyresized($temp_img,$im,0,0,0,0,$temp_width,$temp_height,$srcW,$srcH);
      
   $ni=imagecreatetruecolor($width,$height);
   imagecopyresized($ni,$temp_img,0,0,$src_X,$src_Y,$width,$height,$width,$height);
   $cr = imagejpeg($ni,$dscFile);
   chmod($dscFile, 0777);
      
   if ($cr){
    $this->sm_File = $dscFile;
    return true;
   }else{
    $this->Error = 5;
    return $this->Error;
   }
  }
}


/**
  * 返回错误类型号，用做异常处理
  *
  * @return int
  */
function Err(){
  return $this->Error;
}


/**
  * 上传后的文件名
  *
  * @return unknown
  */
function UpFile(){
  if ($this->doUpFile != ''){
   return $this->doUpFile;
  }else{
   $this->Error = 6;
  }
}


/**
  * 上传文件的路径
  *
  * @return unknown
  */
function filePath(){
  if ($this->doUpFile != ''){
   return $this->Directroy.$this->doUpFile;
  }else{
   $this->Error = 6;
  }  
}


/**
  * 缩略图文件名称
  *
  * @return unknown
  */
function thumbMap(){
  if ($this->sm_File != ''){
   return $this->sm_File;
  }else{
   $this->Error = 6;
  }
}

/**
  * 版本信息
  *
  * @return unknown
  */
function ieb_version(){
  return 'Ver 0.1';
}
}
?>


文件上传表格




选择上传文件





getName();
$old_file_fooder = $imgHandle->getExt();
$file_size=$imgHandle-> getSize();
$file_name=$imgHandle-> newName();
$imgHandle->upload($file_name);
$imgHandle->thumb("small_",160,120);
?>