<?
  

  class resizeimage
  

  {
  

  //图片类型
  

  var $type;
  

  //实际宽度
  

  var $width;
  

  //实际高度
  

  var $height;
  

  //改变后的宽度
  

  var $resize_width;
  

  //改变后的高度
  

  var $resize_height;
  

  //是否裁图
  

  var $cut;
  

  //源图象
  

  var $srcimg;
  

  //目标图象地址
  

  var $dstimg;
  

  //临时建的图象
  

  var $im;
  

  //生成的文件名后缀
  

  var $extstr;
  

  

  function resizeimage($img, $wid, $hei,$extstr,$c=0)
  

  {
  

  $this->srcimg = $img;
  

  $this->resize_width = $wid;
  

  $this->resize_height = $hei;
  

  $this->cut = $c;
  

  $this->extstr = $extstr;
  

  //图片的类型
  

  $this->type = substr(strrchr($this->srcimg,"."),1);
  

  //初始化图象
  

  $this->initi_img();
  

  //目标图象地址
  

  $this -> dst_img();
  

  $this->width = @imagesx($this->im);
  

  $this->height = @imagesy($this->im);
  

  //生成图象
  

  $this->newimg();
  

  @ImageDestroy ($this->im);
  

  }
  

  function newimg()
  

  {
  

  //改变后的图象的比例
  

  $resize_ratio = ($this->resize_width)/($this->resize_height);
  

  //实际图象的比例
  

  if($this->height>0)
  

  $ratio = ($this->width)/($this->height);
  

  if(($this->cut)=="1")
  

  //裁图
  

  {
  

  if($ratio>=$resize_ratio)
  

  //高度优先
  

  {
  

  $newimg = @imagecreatetruecolor($this->resize_width,$this->resize_height);
  

  @imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
  

  @ImageJpeg ($newimg,$this->dstimg);
  

  }
  

  if($ratio<$resize_ratio)
  

  //宽度优先
  

  {
  

  $newimg = @imagecreatetruecolor($this->resize_width,$this->resize_height);
  

  @imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
  

  @ImageJpeg ($newimg,$this->dstimg);
  

  }
  

  }
  

  else
  

  //不裁图
  

  {
  

  if($ratio>=$resize_ratio)
  

  {
  

  $newimg = @imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
  

  @imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
  

  ImageJpeg ($newimg,$this->dstimg);
  

  }
  

  if($ratio<$resize_ratio)
  

  {
  

  $newimg = @imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
  

  @imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
  

  @ImageJpeg ($newimg,$this->dstimg);
  

  }
  

  }
  

  }
  

  //初始化图象
  

  function initi_img()
  

  {
  

  $type=strtolower($this->type);//转换成小写，否则不写扩展名生成不了。
  

  

  if($type=="jpg" || $type=="jpeg" || $type=="jpe")
  

  {
  

  $this->im = @imagecreatefromjpeg($this->srcimg);
  

  }
  

  if($type=="gif")
  

  {
  

  $this->im = @imagecreatefromgif($this->srcimg);
  

  }
  

  if($type=="png")
  

  {
  

  $this->im = @imagecreatefrompng($this->srcimg);
  

  }
  

  if($type=="bmp")
  

  {
  

  $this->im = $this->imagecreatefrombmp($this->srcimg);
  

  }
  

  }
  

  

  function imagecreatefrombmp($p_sFile){
  

  $file = fopen($p_sFile,"rb");
  

  $read = fread($file,10);
  

  while(!feof($file)&&($read<>""))
  

  $read .= fread($file,1024);
  

  $temp = unpack("H*",$read);
  

  $hex =  $temp[1];
  

  $header = substr($hex,0,108);
  

  if (substr($header,0,4)=="424d"){
  

  $header_parts = str_split($header,2);
  

  $width = hexdec($header_parts[19].$header_parts[18]);
  

  $height = hexdec($header_parts[23].$header_parts[22]);
  

  unset($header_parts);
  

  }
  

  $x = 0;
  

  $y = 1;
  

  $image = imagecreatetruecolor($width,$height);
  

  $body = substr($hex,108);
  

  $body_size = (strlen($body)/2);
  

  $header_size = ($width*$height);
  

  $usePadding = ($body_size>($header_size*3)+4);
  

  for ($i=0;$i<$body_size;$i+=3){
  

  if ($x>=$width){
  

  if ($usePadding)
  

  $i    +=    $width%4;
  

  $x    =    0;
  

  $y++;
  

  if ($y>$height)
  

  break;
  

  }
  

  $i_pos    =    $i*2;
  

  $r        =    hexdec($body[$i_pos+4].$body[$i_pos+5]);
  

  $g        =    hexdec($body[$i_pos+2].$body[$i_pos+3]);
  

  $b        =    hexdec($body[$i_pos].$body[$i_pos+1]);
  

  $color    =    imagecolorallocate($image,$r,$g,$b);
  

  imagesetpixel($image,$x,$height-$y,$color);
  

  $x++;
  

  }
  

  unset($body);
  

  return $image;
  

  }
  

  

  //图象目标地址
  

  function dst_img()
  

  {
  

  $full_length  = strlen($this->srcimg);
  

  $type_length  = strlen($this->type);
  

  $name_length  = $full_length-$type_length;
  

  $name         = substr($this->srcimg,0,$name_length-1);
  

  $this->dstimg = $name.$this->extstr.'.'.$this->type;
  

  }
  

  

  static function get_url($img,$extstr){
  

  $imgs = explode('.',$img);
  

  $ext = end($imgs);
  

  $full_length  = strlen($img);
  

  $type_length  = strlen($ext);
  

  $name_length  = $full_length-$type_length;
  

  $name         = substr($img,0,$name_length-1);
  

  return $name.$extstr.'.'.$ext;
  

  }
  

  }
  

  ?>