PHP class to generate thumbnail images

<?php
/**
 * 功能：php生成缩略图片的类
 */
 class ResizeImage{
  public $type;//图片类型
  public $width;//实际宽度
  public $height;//实际高度
  public $resize_width;//改变后的宽度
  public $resize_height;//改变后的高度
  public $cut;//是否裁图
  public $srcimg;//源图象 
  public $dstimg;//目标图象地址
  public $im;//临时创建的图象
  public $quality;//图片质量
  function resizeimage($img,$wid,$hei,$c,$dstpath,$quality=100){
   $this->srcimg=$img;
   $this->resize_width=$wid;
   $this->resize_height=$hei;
   $this->cut=$c;
   $this->quality=$quality;
   $this->type=strtolower(substr(strrchr($this->srcimg,&#39;.&#39;),1));//图片的类型
   $this->initi_img();//初始化图象
   $this -> dst_img($dstpath);//目标图象地址
   @$this->width=imagesx($this->im);
   @$this->height=imagesy($this->im);
   $this->newimg();//生成图象
   @ImageDestroy($this->im);
  }
  function newimg(){
   $resize_ratio=($this->resize_width)/($this->resize_height);//改变后的图象的比例
   @$ratio=($this->width)/($this->height);//实际图象的比例
   if(($this->cut)==&#39;1&#39;){//裁图
    if($img_func===&#39;imagepng&#39;&&(str_replace(&#39;.&#39;,&#39;&#39;,PHP_VERSION)>=512)){ //针对php版本大于5.12参数变化后的处理情况
     $quality=9;
    }
    if($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,$this->quality);
    }
    if($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,$this->quality);
    }
   }else{//不裁图
    if($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,$this->dstimg,$this->quality);
    }
    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,$this->dstimg,$this->quality);
    }
   }
  }
  function initi_img(){//初始化图象
   if($this->type==&#39;jpg&#39; || $this->type==&#39;jpeg&#39;){
    $this->im=imagecreatefromjpeg($this->srcimg);
   }
   if($this->type==&#39;gif&#39;){
    $this->im=imagecreatefromgif($this->srcimg);
   }
   if($this->type==&#39;png&#39;){
    $this->im=imagecreatefrompng($this->srcimg);
   }
   if($this->type==&#39;wbm&#39;){
    @$this->im=imagecreatefromwbmp($this->srcimg);
   }
   if($this->type==&#39;bmp&#39;){
    $this->im=$this->ImageCreateFromBMP($this->srcimg);
   }
  }
  function dst_img($dstpath){//图象目标地址
   $full_length=strlen($this->srcimg);
   $type_length=strlen($this->type);
   $name_length=$full_length-$type_length;
   $name=substr($this->srcimg,0,$name_length-1);
   $this->dstimg=$dstpath;
   //echo $this->dstimg;
  }
   
  function ImageCreateFromBMP($filename){ //自定义函数处理bmp图片
   if(!$f1=fopen($filename,"rb"))returnFALSE;
   $FILE=unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset",fread($f1,14));
   if($FILE[&#39;file_type&#39;]!=19778)returnFALSE;
   $BMP=unpack(&#39;Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel&#39;.
     &#39;/Vcompression/Vsize_bitmap/Vhoriz_resolution&#39;.
     &#39;/Vvert_resolution/Vcolors_used/Vcolors_important&#39;,fread($f1,40));
   $BMP[&#39;colors&#39;]=pow(2,$BMP[&#39;bits_per_pixel&#39;]);
   if($BMP[&#39;size_bitmap&#39;]==0)$BMP[&#39;size_bitmap&#39;]=$FILE[&#39;file_size&#39;]-$FILE[&#39;bitmap_offset&#39;];
   $BMP[&#39;bytes_per_pixel&#39;]=$BMP[&#39;bits_per_pixel&#39;]/8;
   $BMP[&#39;bytes_per_pixel2&#39;]=ceil($BMP[&#39;bytes_per_pixel&#39;]);
   $BMP[&#39;decal&#39;]=($BMP[&#39;width&#39;]*$BMP[&#39;bytes_per_pixel&#39;]/4);
   $BMP[&#39;decal&#39;]-=floor($BMP[&#39;width&#39;]*$BMP[&#39;bytes_per_pixel&#39;]/4);
   $BMP[&#39;decal&#39;]=4-(4*$BMP[&#39;decal&#39;]);
   if($BMP[&#39;decal&#39;]==4)$BMP[&#39;decal&#39;]=0;
   $PALETTE=array();
   if($BMP[&#39;colors&#39;]<16777216)
   {
    $PALETTE=unpack(&#39;V&#39;.$BMP[&#39;colors&#39;],fread($f1,$BMP[&#39;colors&#39;]*4));
   }
   $IMG=fread($f1,$BMP[&#39;size_bitmap&#39;]);
   $VIDE=chr(0);
   $res=imagecreatetruecolor($BMP[&#39;width&#39;],$BMP[&#39;height&#39;]);
   $P=0;
   $Y=$BMP[&#39;height&#39;]-1;
   while($Y>=0)
   {
    $X=0;
    while($X<$BMP[&#39;width&#39;])
    {
     if($BMP[&#39;bits_per_pixel&#39;]==24)
      $COLOR=unpack("V",substr($IMG,$P,3).$VIDE);
     elseif($BMP[&#39;bits_per_pixel&#39;]==16)
     {
      $COLOR=unpack("n",substr($IMG,$P,2));
      $COLOR[1]=$PALETTE[$COLOR[1]+1];
     }
     elseif($BMP[&#39;bits_per_pixel&#39;]==8)
     {
      $COLOR=unpack("n",$VIDE.substr($IMG,$P,1));
      $COLOR[1]=$PALETTE[$COLOR[1]+1];
     }
     elseif($BMP[&#39;bits_per_pixel&#39;]==4)
     {
      $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
      if(($P*2)%2==0)$COLOR[1]=($COLOR[1]>>4);else$COLOR[1]=($COLOR[1]&0x0F);
      $COLOR[1]=$PALETTE[$COLOR[1]+1];
     }
     elseif($BMP[&#39;bits_per_pixel&#39;]==1)
     {
      $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
      if(($P*8)%8==0)$COLOR[1]=$COLOR[1]>>7;
      elseif(($P*8)%8==1)$COLOR[1]=($COLOR[1]&0x40)>>6;
      elseif(($P*8)%8==2)$COLOR[1]=($COLOR[1]&0x20)>>5;
      elseif(($P*8)%8==3)$COLOR[1]=($COLOR[1]&0x10)>>4;
      elseif(($P*8)%8==4)$COLOR[1]=($COLOR[1]&0x8)>>3;
      elseif(($P*8)%8==5)$COLOR[1]=($COLOR[1]&0x4)>>2;
      elseif(($P*8)%8==6)$COLOR[1]=($COLOR[1]&0x2)>>1;
      elseif(($P*8)%8==7)$COLOR[1]=($COLOR[1]&0x1);
      $COLOR[1]=$PALETTE[$COLOR[1]+1];
     }
     else
      returnFALSE;
     imagesetpixel($res,$X,$Y,$COLOR[1]);
     $X++;
     $P+=$BMP[&#39;bytes_per_pixel&#39;];
    }
    $Y--;
    $P+=$BMP[&#39;decal&#39;];
   }
   fclose($f1);
   return$res;
  }
   
 }
?>

$resizeimage=new ResizeImage('upload/abc.bmp', '120', '90', '0', 'upload/xabc.bmp');

 <img src=”phpThumb.php?src=test.jpg&w=200&h=150&fltr[]=ric|20|20&f=png” /> 

 Adjust the path to phpThumb according to where you place the phpThumb files.

 <html> 
 <head>
 </head> 
 <body> 
  <img src="phpThumb/phpThumb.php?src=../images/test.jpg&w=400&fltr[]=fram|3|2|CC9966|333333|CCCCCC" alt=""> 
 </body> 
 </html>

//加载类库文件

 require_once 'path/to/ThumbLib.inc.php';

 //实例化类库，传入你要处理的图片的地址可以是网络地址，也可以是本地地址

 $thumb = PhpThumbFactory::create('http://www.shlongyingjixie.com/');

 //把图片等比缩小到最大宽度 100px或者最高100px，当只输入一个参数的时候，是限制最宽的尺寸。

 $thumb->resize(100, 100);

 //把图片等比缩小到原来的百分数，比如50就是原来的50%。

 $thumb->resizePercent(50);

 //截取一个175px * 175px的图片，注意这个是截取，超出的部分直接裁切掉，不是强制改变尺寸。
 $thumb->adaptiveResize(175, 175);

 //从图片的中心计算，截取200px * 100px的图片。

 $thumb->cropFromCenter(200, 100);

 //截图，前两个参数分别是需要解出的图片的右上角的坐标X,Y。 后面两个参数是需要解出的图片宽，高。

 $thumb->crop(100, 100, 300, 200);
 
 //把图片顺时针反转180度

 $thumb->rotateImageNDegrees(180);

 //保存（生成）图片,你可以保存其他格式，详细参考文档

 $thumb->save( 'NewPath/Of/image.jpg ' );