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  • PHP生成缩略图的一个方法类(转)

    //使用如下类就可以生成图片缩略图
    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;
        //临时创建的图象
        var $im;
     
        function resizeimage($img, $wid, $hei,$c,$dstpath)
        {
            $this->srcimg = $img;
            $this->resize_width = $wid;
            $this->resize_height = $hei;
            $this->cut = $c;
            //图片的类型   
    $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));
            //初始化图象
            $this->initi_img();
            //目标图象地址
            $this -> dst_img($dstpath);
            //--
            $this->width = imagesx($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
            $ratio = ($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,$this->dstimg);
                }
            }
        }
        //初始化图象
        function initi_img()
        {
            if($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);
            }
        }
        //图象目标地址
        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;
        }
    }
     
     
    //就只用下面的一句话,就能生成缩略图,其中,源文件和缩略图地址可以相同,200,100分别代表宽和高,第4个参数表示是否截图
    $resizeimage = new resizeimage($save_path.$file_name, "185", "130", "0",$save_path."c_".$file_name);

    此代码来源于网络,经本人证实确实有效

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  • 原文地址:https://www.cnblogs.com/xujanus/p/3437509.html
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