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PHP生成图片缩略图方法及代码

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,类的源码见下文

调用此类的方法:
$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

//使用如下类就可以生成图片缩略图,
[php]
<?php
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;
}
}
?>

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