上传文件生成缩略图

昨天公司突然要一个上传文件带附件,还要一个带图片上传功能并且要生成缩略图效果,下面我就把我的代码贴出来吧.

首先来看看up.htm文件,代码如下:http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
http://www.w3.org/1999/xhtml">

if($_FILES['image']['name']){
    if($_FILES['image']['size']){
    if($_FILES['image']['type'] == "image/pjpeg"){
     $im = @imagecreatefromjpeg($_FILES['image']['tmp_name']);
     $n_bmp.='.jpg';
    }elseif($_FILES['image']['type'] == "image/x-png"){
     $im = @imagecreatefrompng($_FILES['image']['tmp_name']);
     $n_bmp.='.png';
    }elseif($_FILES['image']['type'] == "image/gif"){
     $im = @imagecreatefromgif($_FILES['image']['tmp_name']);
     $n_bmp.='.gif';
    }    
    }
    ResizeImage($im,120,60,md5(date("Y-m-d H:i:s")));    
    ImageDestroy ($im);
    $tag=1;
   }

function ResizeImage($im,$maxwidth,$maxheight,$name){
   $width = imagesx($im);
   $height = imagesy($im);
  if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
   if($maxwidth && $width > $maxwidth){
   $widthratio = $maxwidth/$width;
   $RESIZEWIDTH=true;
   }
   if($maxheight && $height > $maxheight){
   $heightratio = $maxheight/$height;
   $RESIZEHEIGHT=true;
   }
  if($RESIZEWIDTH && $RESIZEHEIGHT){
  if($widthratio < $heightratio){
   $ratio = $widthratio;
   }else{
   $ratio = $heightratio;
   }
  }elseif($RESIZEWIDTH){
  $ratio = $widthratio;
  }elseif($RESIZEHEIGHT){
  $ratio = $heightratio;
  }
  $newwidth = $width * $ratio;
  $newheight = $height * $ratio;
  if(function_exists("imagecopyresampled")){
  $newim = imagecreatetruecolor($newwidth, $newheight);
  imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }else{
  $newim = imagecreate($newwidth, $newheight);
  imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }
  ImageJpeg ($newim,$name . ".jpg");
  ImageDestroy ($newim);
  }else{
  ImageJpeg ($im,$name . ".jpg");
  }
  }

就这么简单了,上页这种就是生成文件到目录了,还有一种就生成二进制在网页显示,当然你也可以保存到数据库了.然后读出.