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标题: 基于GD2图形库的PHP生成图片缩略图类代码分享 [打印本页]

作者: 网络通达 时间: 2018-2-14 05:49

         要使用PHP生成图片缩略图,要保证你的PHP服务器安装了GD2图形库使用一个类生成图片的缩略图
1.使用方法
$resizeimage = new resizeimage("图片源文件地址", "200", "100", "0","缩略图地址");
//就只用上面的一句话,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
2. 缩略图类代码
//使用如下类就可以生成图片缩略图,

src$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
   {
      $new($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,$this->dstimg);
   }
   if($ratioresize_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)
   {
      $new($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,$this->dstimg);
   }
   if($ratioresize_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);
$this->dst$dstpath;

//echo $this->dstimg;
  }
}
?>


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