PHP图片处理类

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一个我经常使用的图片处理类,很好用的。给大家推荐一下!主要包括图片的裁剪,缩放,加水印等。下面是一些简单的使用方法。
include("imageclass.php");   //这里注意imageclass.php的路径
$imgs=new image();
$imgs->param($tempFile);
if(!$imgs->thumb($targetFile,600,500))die('--图像上传失败!');  //对图片进行缩放

$imgs->water($targetFile,$water,$pos=0,$pct=50);主要包括两个参数,$targetFile为已经上传到服务器的文件路径,$water为水印图片,$pos为水印图片位置,$pct为透明度;
$pos位置说明:
0://随机
1://1为顶端居左
2://2为顶端居中
3://3为顶端居右
4://4为中部居左
5://5为中部居中
6://6为中部居右
7://7为底端居左
8://8为底端居中
9://9为底端居右


将//里边的内容保存在imageclass.php里边,就可以调用了。
///////////////////////////////////////////////////////////////
<?php

class image {
       // 当前图片
       protected $img;
       // 图像types 对应表
       protected $types = array(
                       1 => 'gif',
                       2 => 'jpg',
                       3 => 'png',
                       6 => 'bmp'
                   );

       // image
       public function __construct($img=''){
               !$img &&$this->param($img);
       }

       // Info
       public function param($img){
               $this->img = $img;
               return $this;
       }

       // imageInfo
       public function getImageInfo($img){
               $info = @getimagesize($img);
               if(isset($this->types[$info[2]])){
                       $info['ext'] = $info['type'] =$this->types[$info[2]];
               } else{
                       $info['ext'] = $info['type'] = 'jpg';
               }
               $info['type'] == 'jpg' &&$info['type'] = 'jpeg';
               $info['size'] = @filesize($img);
               return $info;
       }

       // thumb(新图地址, 宽, 高, 裁剪, 允许放大)
       public functionthumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){
       
       // 获取原图信息
       $info  =$this->getImageInfo($this->img);
       if(!empty($info[0])) {
           $old_w  = $info[0];
           $old_h  = $info[1];
           $type   = $info['type'];
           $ext    =$info['ext'];
           unset($info);
           // 如果原图比缩略图小 并且不允许放大
           if($old_w < $new_h&& $old_h < $new_w&& !$big){
                   return false;
           }
           // 裁剪图片
           if($cut == 0){ // 等比列
                   $scale = min($new_w/$old_w, $new_h/$old_h); // 计算缩放比例
                   $width  = (int)($old_w*$scale); // 缩略图尺寸
                   $height = (int)($old_h*$scale);
                   $start_w = $start_h = 0;
                   $end_w = $old_w;
                   $end_h = $old_h;
           } elseif($cut == 1){ // center center 裁剪
                       $scale1 = round($new_w/$new_h,2);
                       $scale2 = round($old_w/$old_h,2);
                       if($scale1 > $scale2){
                               $end_h = round($old_w/$scale1,2);
                               $start_h = ($old_h-$end_h)/2;
                               $start_w  = 0;
                               $end_w    =$old_w;
                       } else{
                               $end_w  = round($old_h*$scale1,2);
                               $start_w  = ($old_w-$end_w)/2;
                               $start_h = 0;
                               $end_h   = $old_h;
                       }
                       $width = $new_w;
                   $height= $new_h;
               } elseif($cut == 2){ // left top 裁剪
                       $scale1 = round($new_w/$new_h,2);
                   $scale2 = round($old_w/$old_h,2);
                   if($scale1 > $scale2){
                           $end_h = round($old_w/$scale1,2);
                           $end_w = $old_w;
                   } else{
                           $end_w = round($old_h*$scale1,2);
                           $end_h = $old_h;
                   }
                   $start_w = 0;
                   $start_h = 0;
                   $width = $new_w;
                   $height= $new_h;
               }
           // 载入原图
           $createFun  = 'ImageCreateFrom'.$type;
           $oldimg    = $createFun($this->img);
           // 创建缩略图
           if($type!='gif' &&function_exists('imagecreatetruecolor')){
               $newimg = imagecreatetruecolor($width, $height);
           } else{
               $newimg = imagecreate($width, $height);
           }
           // 复制图片
           if(function_exists("ImageCopyResampled")){
                   ImageCopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h,$width, $height, $end_w,$end_h);
           } else{
               ImageCopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h,$width, $height, $end_w,$end_h);
           }

           // 对jpeg图形设置隔行扫描
           $type == 'jpeg' &&imageinterlace($newimg,1);
           // 生成图片
           $imageFun = 'image'.$type;
           !@$imageFun($newimg,$filename,100)&& die('保存失败!检查目录是否存在并且可写?');
           ImageDestroy($newimg);
           ImageDestroy($oldimg);
           return $filename;
       }
       return false;
    }

    //water(保存地址,水印图片,水印位置,透明度)
       public function water($filename,$water,$pos=0,$pct=50){
               // 加载水印图片
               $info = $this->getImageInfo($water);
               if(!empty($info[0])){
                       $water_w = $info[0];
                       $water_h = $info[1];
                       $type = $info['type'];
                       $fun  = 'imagecreatefrom'.$type;
                       $waterimg = $fun($water);
               } else{
                       return false;
               }
               // 加载背景图片
               $info =$this->getImageInfo($this->img);
               if(!empty($info[0])){
                       $old_w = $info[0];
                       $old_h = $info[1];
                       $type  = $info['type'];
                       $fun   ='imagecreatefrom'.$type;
                       $oldimg = $fun($this->img);
               } else{
                       return false;
               }
               // 剪切水印
               $water_w >$old_w &&$water_w = $old_w;
               $water_h >$old_h &&$water_h = $old_h;

               // 水印位置
               switch($pos){
                   case 0://随机
                   $posX = rand(0,($old_w - $water_w));
                   $posY = rand(0,($old_h - $water_h));
                   break;
               case 1://1为顶端居左
                   $posX = 0;
                   $posY = 0;
                   break;
               case 2://2为顶端居中
                   $posX = ($old_w - $water_w) / 2;
                   $posY = 0;
                   break;
               case 3://3为顶端居右
                   $posX = $old_w - $water_w;
                   $posY = 0;
                   break;
               case 4://4为中部居左
                   $posX = 0;
                   $posY = ($old_h - $water_h) / 2;
                   break;
               case 5://5为中部居中
                   $posX = ($old_w - $water_w) / 2;
                   $posY = ($old_h - $water_h) / 2;
                   break;
               case 6://6为中部居右
                   $posX = $old_w - $water_w;
                   $posY = ($old_h - $water_h) / 2;
                   break;
               case 7://7为底端居左
                   $posX = 0;
                   $posY = $old_h - $water_h;
                   break;
               case 8://8为底端居中
                   $posX = ($old_w - $water_w) / 2;
                   $posY = $old_h - $water_h;
                   break;
               case 9://9为底端居右
                   $posX = $old_w - $water_w;
                   $posY = $old_h - $water_h;
                   break;
               default: //随机
                   $posX = rand(0,($old_w - $water_w));
                   $posY = rand(0,($old_h - $water_h));
                   break;
               }
           // 设定图像的混色模式
               imagealphablending($oldimg, true);
               // 添加水印
               imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0,$water_w,$water_h,$pct);
               $fun = 'image'.$type;
               !@$fun($oldimg, $filename,100)&& die('保存失败!检查目录是否存在并且可写?');
                 imagedestroy($oldimg);
                 imagedestroy($waterimg);
                 return $filename;
       }
}
?>
///////////////////////////////////////////////////////////////////////////
祝:使用顺利!

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