【www.gdgbn.com--元旦图片】

if(!isset($_session))session_start();

/**2010-6-22
 * $data 数组类型    包含以下变量
 -------------------------------
 * $sub_type        submit类型(upload：上传按钮    delete：删除按钮)，默认upload
 * $file            通过表单获取的$_files["filename"]数组
 * $img_tag_id        预览图片的的id值
 * $img_dir            上传图片的目录
 * $max_file_size    单位m(兆)，默认：1m
 * $type_array        允许的上传的图片类型(默认：image/pjpeg、image/jpeg、image/gif)
 **/
function upload($data){
    if(!$data["file"]){
        echo "<script>alert("file不能为空！");</script>";exit;
    }
    if(!$data["img_tag_id"]){
        echo "<script>alert("预览图片标签id不能为空！");</script>";exit;
    }
    if(!$data["img_dir"]){
        echo "<script>alert("图片上传目录不能为空！");</script>";exit;
    }
    if(!isset($data["max_file_size"])){
        $data["max_file_size"] = 1024 * 1024;
    }else{
        $data["max_file_size"] = $data["max_file_size"] * 1024 * 1024;
    }
    if(!isset($data["type_array"])){
        $data["type_array"] = array("image/pjpeg", "image/jpeg", "image/gif");
    }
    if(!isset($data["sub_type"])){
        $data["sub_type"] = "upload";
    }

    $imgpath = "";
    if(isset($data["sub_type"]) && $data["sub_type"] == "delete"){
        if(isset($_session["name"]) && $_session["name"]){
            if(is_file($_session["imgpath"])){
                $b = unlink($_session["imgpath"]);
            }
            unset($_session["name"], $_session["imgpath"]);
            if(!isset($_session["name"])){
                echo "<script>alert("删除成功！");</script>";
                echo "<script>parent.document.getelementbyid("".$data["img_tag_id"]."").style.display = "none";</script>";
            }else{
                echo "<script>alert("删除失败！");</script>";
            }
        }else{
            echo "<script>alert("没有稿件！");</script>";
        }exit;
    }

    if(isset($_session["imgpath"]) && $_session["imgpath"]){
        echo "<script>alert("稿件已经存在，要想重新上传请删除原来的稿件！");</script>";exit;
    }
    if(!in_array($data["file"]["type"], $data["type_array"])){
        echo "<script>alert("稿件类型不匹配，请上传.jpg、.gif和.png格式的图片！");</script>";exit;
    }
    if($data["file"]["size"] > $data["max_file_size"]){
        echo "<script>alert("您上传的稿件过大，请选择2m以下的图片上传！");</script>";exit;
    }

    if(!is_dir($data["img_dir"])){
        @mkdir($data["img_dir"], 0777, true);
    }
    $imgpath    = $data["img_dir"]."/".date("his", time()).rand(100, 999).$data["file"]["name"];
    $isupload    = move_uploaded_file($data["file"]["tmp_name"], $imgpath);
    if(!$isupload){
        echo "<script>alert("稿件上传失败，请尝试重新上传！");</script>";exit;
    }else{
        echo "<script>alert("稿件上传成功！");</script>";
    }
    $_session["name"]        = $data["file"]["name"];
    $_session["imgpath"]    = $imgpath;

    return $imgpath;
}

/*test_start*/
$sub_type = "";
if(isset($_post["submit_upload"]))$sub_type = "upload";
if(isset($_post["submit_delete"]))$sub_type = "delete";
if($sub_type){//echo "<script>alert("".$sub_type."");</script>";exit;
    $data = array(    "sub_type"        => $sub_type,
                    "file"            => $_files["file"],
                    "img_tag_id"    => "picview",
                    "img_dir"        => "upload_img",
                  );
    $imgpath = upload($data);
}else{
    $imgpath = isset($_session["imgpath"])? $_session["imgpath"]: "";
}
?>

<script>
if(""){
    parent.document.getelementbyid("picview").src = "";
    parent.document.getelementbyid("picview").style.display = "block";
}
</script>

本文来源：http://www.gdgbn.com/ps/27379/