php实现图片的操作，也就是裁切，跟加水印

	 

	<?

	class image {

	      

	        protected $img;    

	        protected $types = array(

	                        1 => 'gif',

	                        2 => 'jpg',

	                        3 => 'png',

	                        6 => 'bmp'

	                    );

	       

	        public function __construct($img=''){

	                !$img && $this->param($img);

	        }

	 

	        public function param($img){

	                $this->img = $img;

	                return $this;

	        }

	 

	        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;

	        }

	 

	        public function thumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){

	        $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);

	            if($old_w < $new_h && $old_h < $new_w && !$big){

	                    return false;

	            }

	            if($cut == 0){

	                    $scale = min($new_w/$old_w, $new_h/$old_h);

	                    $width  = (int)($old_w*$scale);

	                    $height = (int)($old_h*$scale);

	                    $start_w = $start_h = 0;

	                    $end_w = $old_w;

	                    $end_h = $old_h;

	            } elseif($cut == 1){

	                        $scale1 = round($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;

	            &nb

补充：Web开发 , php ,

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