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php如何把文件上传到服务器上

conn.php:

<?php 
$id=mysql_connect(‘localhost‘,‘root‘,‘root‘);
mysql_select_db("db_database12",$id);
mysql_query("set names gb2312");
?>

index.php:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>限制大小的文件上传</title>
<style type="text/css">
<!--
body {
	margin-left: 00px;
	margin-top: 0px;
	margin-right: 0px;
	margin-bottom: 0px;
}
-->
</style></head>

<body>
<table width="385" height="185" border="0" cellpadding="0" cellspacing="0" background="image/316.JPG">
  <tr>
    <td width="130" height="75">&nbsp;</td>
    <td width="200">&nbsp;</td>
    <td width="55">&nbsp;</td>
  </tr>
  <form name="form1" method="post" action="index_ok.php" enctype="multipart/form-data">
  <tr>
    <td height="38">&nbsp;</td>
    <td align="center" valign="middle"><input name="file3" type="file" id="file3" size="15" maxlength="150">
   </td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td height="30" align="right">&nbsp;</td>
    <td align="center" valign="top"><input type="submit" name="Submit" value="http://www.mamicode.com/提交">&nbsp;&nbsp;&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
  </form>
  <tr>
    <td height="42">&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table>
</body>
</html>

index_ok.php:

<?php 
session_start(); 
include("conn.php");?>
<?php
 if($Submit=="提交"){
$data=http://www.mamicode.com/date("Y-m-d");
$file_name="files";
$filesize=$_FILES[‘file3‘][‘size‘];
if($filesize>2881064151){
echo "对不起,您上传的文件超过了规定的大小!!";
echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php?lmbs=文件上传\">将在3秒钟后返回前页...";
}else{
$path = ‘./upfiles/‘. $_FILES[‘file3‘][‘name‘];
if (move_uploaded_file($_FILES[‘file3‘][‘tmp_name‘],$path)) { 
	$query="insert into tb_file2(file_name,file_text,data)values(‘$file_name‘,‘$path‘,‘$data‘)";
	$result=mysql_query($query);
	if($result=true){ 
	echo "上传成功!!";
	echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php?lmbs=文件上传\">"; 
	}else{echo "文件上传失败!!";
          echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php?lmbs=文件上传\">";}
}}}
?>

php如何把文件上传到服务器上