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标题: 用GD生成缩略图 [打印本页]

作者: gydoesit 时间: 2006-01-13 17:11
标题: 用GD生成缩略图
转的,原文地址不见了
$small_image_name="image_name";
// 生成图片的宽度
$resizewidth=400;
// 生成图片的高度
$resizeheight=400;
function ResizeImage($im,$maxwidth,$maxheight,$name){
$resizewidth = false;
$resizeheight = false;
$widthratio = 0;
$heightratio = 0;
$width = imagesx($im);
$height = imagesy($im);
//如果最大不为零,且大于
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
if(!empty($_FILES['image']['size'])){
if($_FILES['image']['type'] == "image/pjpeg"){
      $im = imagecreatefromjpeg($_FILES['image']['tmp_name']);
}elseif($_FILES['image']['type'] == "image/x-png"){
      $im = imagecreatefrompng($_FILES['image']['tmp_name']);
}elseif($_FILES['image']['type'] == "image/gif"){
      $im = imagecreatefromgif($_FILES['image']['tmp_name']);
}
if($im){
      if(file_exists("$small_image_name.jpg")){
         unlink("$small_image_name.jpg");
      }
      ResizeImage($im,$resizewidth,$resizeheight,$small_image_name);
      ImageDestroy ($im);
}
}
?>
">

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