PHP上传文件

<form action="" enctype="multipart/form-data" method="post">
    上传文件：<input type="file" name="upload"><br/>
    <input type="submit" value="提交">
</form>
<?php
    if(is_uploaded_file($_FILES['upload']['tmp_name'])) {
        $upload = $_FILES["upload"];
        $name = $upload["name"];//上传文件的文件名
        $types = $upload["type"];//上传文件的类型
        $size = $upload["size"];//上传文件的大小
        $tmp_name = $upload["tmp_name"];//上传文件的临时存放路径
        if(!empty($name)){
            $file_types = explode(".", $name);
            $file_type = $file_types[count($file_types)-1];
            if(strtolower($file_type)!="txt"){
                echo "不是txt文件，请重新上传!";
            }
            $savePath = "E:\wamp\www\test\upload";
            $str = date('YMDhis');
            $file_name = $str . '.' . $file_type;
            if (! copy ($tmp_name, $savePath.'\'.$file_name)){
                 echo("failed");
            }
            else{
                echo($savePath .'\'. $file_name);
                echo("success<br>");
            }
        }
    }
?>

 PHP上传文件改进版：

<?php
if($_FILES["file"]["type"] == "image/gif" || $_FILES["file"]["type"] == "image/jpeg" || $_FILES["file"]["type"] == "image/pjpeg" && ($_FILES["file"]["size"]) < 20000){
    if($_FILES["file"]["error"] > 0){
        echo "Return Code:". $_FILES["file"]["error"];
    }else{
        echo "Upload:" . $_FILES["file"]["name"];
        echo "Type:" . $_FILES["file"]["type"];
        echo "Size:" . ($_FILES["file"]["size"]/1024) . "Kb";
        echo "Temp file" . $_FILES["file"]["tmp_name"];
        if(file_exists("upload/".$_FILES["file"]["name"])){
            echo $_FILES["file"]["name"] . "already exists.";
        }else{
            move_uploaded_file($_FILES["file"]["tmp_name"], "upload/".$_FILES["file"]["name"]);
            echo "Stored in:" . "upload/" . $_FILES["file"]["name"];
        }
    }
}else{
    echo "Invalid file";
}
?>