上传图片并生成相关缩略图-PHP

if(!empty($_FILES["fileField"]["name"])){//检测表单传递文件数据
    $fileinfo = $_FILES["fileField"];
    if($fileinfo['size'] < 10000000 && $fileinfo['size'] > 0){//大小筛选
        if($fileinfo['type'] == 'image/jpeg'||'image/jpg'||'image/png'||'image/gif' ){//类型筛选
            if(!file_exists("./uploadimages")){
                mkdir("./uploadimages");
            }
            move_uploaded_file($fileinfo['tmp_name'],"uploadimages/".$fileinfo['name']) or die("文件上传失败");
            $path=(string)$fileinfo['name'];

            $sql="insert into banner values(' ','$path','$alt','$riqi',' ','$url')";
            $insert_id=mysql_query($sql);
            if($insert_id){
                makezoom("uploadimages/".$fileinfo['name'],200,100,'uploadimages/200_100/');
                makezoom("uploadimages/".$fileinfo['name'],1920,900,'uploadimages/1920_900/');
                echo "<script>alert('添加成功');</script>";
                echo "<script language=\"javascript\">setTimeout('window.history.back(-1)',0);</script>";

            }else{
                $error=mysql_error();
                echo $error;
                //echo "<script>alert('添加失败'.$error);</script>";
                echo "<script language=\"javascript\">setTimeout('window.history.back(-1)',3000);</script>";
            }

        }else{echo "(请上传正确格式的图片，jpg,png,gif)";
            echo "<script language=\"javascript\">setTimeout('window.history.back(-1)',3000);</script>";}

    }else{
        echo ("图片过大或者未知...");
        echo "<script language=\"javascript\">setTimeout('window.history.back(-1)',3000);</script>";
    }
}

function  makezoom($src='moban.com/images/bg1.jpg',$width=200,$height=200,$dir = 'uploadimages/200_200/',$delsrc=false)//产生缩略图函数
{
    if(!file_exists($dir)){
        mkdir($dir);
    }
    $srcInfo = getimagesize($src);//获取图片信息数组
    $srcType = image_type_to_extension($srcInfo[2], false);//获取图片类型
    $fun = 'imagecreatefrom' . $srcType;//由图片文件创建图像资源
    $srcImage = $fun($src);
//创建缩略图资源
    //$scale = $srcInfo[0] / $srcInfo[1];
    //$height = $width / $scale;
    $zoomImg = imagecreatetruecolor($width, $height);
//图像资源放到缩略图资源上
    imagecopyresampled($zoomImg, $srcImage, 0, 0, 0, 0, $width, $height, $srcInfo[0], $srcInfo[1]);
//输出缩略图资源

    $output = 'image' . $srcType;
    $output($zoomImg, $dir. basename($src));
//销毁资源
    imagedestroy($srcImage);
    imagedestroy($zoomImg);
//删除原图
    if($delsrc){
        unlink($src);
    }
}