首先来一段简单的PHP上传图片生成缩略图的详细代码，分享给大家供大家参考，具体内容如下
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PHP
function createThumbnail($imageDirectory,$imageName,$thumbDirectory,$thumbWidth,$quality){
$details = getimagesize("$imageDirectory/$imageName") or die('Please only upload images.');
$type = preg_replace('@^.+(?<=/)(.+)$@','$1',$details['mime']);
eval('$srcImg = imagecreatefrom'.$type.'("$imageDirectory/$imageName");');
$thumbHeight = $details[1] * ($thumbWidth / $details[0]);
$thumbImg = imagecreatetruecolor($thumbWidth,$thumbHeight);
imagecopyresampled($thumbImg,$srcImg,$thumbHeight,$details[0],$details[1]);
eval('image'.$type.'($thumbImg,"$thumbDirectory/$imageName"'.
(($type=='jpeg')?',$quality':'').');');
imagedestroy($srcImg);
imagedestroy($thumbImg);
}
foreach ($_FILES["pictures"]["error"] as $key => $error) {
if ($error == UPLOAD_ERR_OK) {
$tmp_name = $_FILES["pictures"]["tmp_name"][$key];
$name = $_FILES["pictures"]["name"][$key];
move_uploaded_file($tmp_name,"data/$name");
createThumbnail("/location/of/main/image",$name,"/location/to/store/thumb",120,80);
//120 = thumb width :: 80 = thumb quality (1-100)
}
}
?>
接下来再为大家推荐一个实例PHP使用GD库上传图片以及创建缩略图，直接看代码：
GD库是
PHP进行图象操作一个很强大的库。
先在PHP.ini里增加一行引用：extension=PHP_gd2.dll
重启apache，做一个测试页var_dump(gd_info());输出数据表明GD库引用成功。
文件上传(只允许上传jpg类型图片)
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PHP
//上传图片保存地址
$uploadfile = "upfiles/".$_FILES['upfile']['name'];
//缩略图保存地址
$smallfile = "upfiles/small_".$_FILES['upfile']['name'];
if($_FILES['upfile']['type'] != "image/jpeg")
{
echo '文件类型错误';
}
else
{
move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile); //上传文件
$dstW=200;//缩略图宽
$dstH=200;//缩略图高
$src_image=ImageCreateFromJPEG($uploadfile);
$srcW=ImageSX($src_image); //获得图片宽
$srcH=ImageSY($src_image); //获得图片高
$dst_image=ImageCreateTrueColor($dstW,$dstH);
ImageCopyResized($dst_image,$src_image,$dstW,$dstH,$srcW,$srcH);
ImageJpeg($dst_image,$smallfile);
