實用PHP生成縮略圖類

實用PHP生成縮略圖類，具體代碼如下：

<?PHP      
class resizeimage      
{      
    //圖片類型      
    var $type;      
    //實際寬度      
    var $width;      
    //實際高度      
    var $height;      
    //改變後的寬度      
    var $resize_width;      
    //改變後的高度      
    var $resize_height;      
    //是否裁圖      
    var $cut;      
    //源圖象      
    var $srcimg;      
    //目標圖象地址      
    var $dstimg;      
    //臨時創建的圖象      
    var $im;      
    function resizeimage($img, $wid, $hei,$c,$dstpath)      
    {      
        $this->srcimg = $img;      
        $this->resize_width = $wid;      
        $this->resize_height = $hei;      
        $this->cut = $c;      
        //圖片的類型      
     
$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));      
        //初始化圖象      
        $this->initi_img();      
        //目標圖象地址      
        $this -> dst_img($dstpath);      
        //--      
        $this->width = imagesx($this->im);      
        $this->height = imagesy($this->im);      
        //生成圖象      
        $this->newimg();      
        ImageDestroy ($this->im);      
    }      
    function newimg()      
    {      
        //改變後的圖象的比例      
        $resize_ratio = ($this->resize_width)/($this->resize_height);      
        //實際圖象的比例      
        $ratio = ($this->width)/($this->height);      
        if(($this->cut)=="1")      
        //裁圖      
        {      
            if($ratio>=$resize_ratio)      
            //高度優先      
            {      
                $newimg = imagecreatetruecolor($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)      
            //寬度優先      
            {      
                $newimg = imagecreatetruecolor($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,$this->dstimg);      
            }      
        }      
        else     
        //不裁圖      
        {      
            if($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,$this->dstimg);      
            }      
        }      
    }      
    //初始化圖象      
    function initi_img()      
    {      
        if($this->type=="jpg")      
        {      
            $this->im = imagecreatefromjpeg($this->srcimg);      
        }      
        if($this->type=="gif")      
        {      
            $this->im = imagecreatefromgif($this->srcimg);      
        }      
        if($this->type=="png")      
        {      
            $this->im = imagecreatefrompng($this->srcimg);      
        }      
    }      
    //圖象目標地址      
    function dst_img($dstpath)      
    {      
        $full_length  = strlen($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;      
    }      
}      
     
$resizeimage = new resizeimage("11.jpg", "200", "150", "1","17.jpg");      
?>