PHP timestamp naming of uploaded images (save path), _PHP tutorial

PHP upload image timestamp naming (save path),

html code:

<div id="images" style="width:250px;height:120px;background:#fff;border:1px solid #ccc;">  
  <h2><strong>图片导入</strong></h2> 
  <form enctype="multipart/form-data" action="./includer/importimg.inc.php&#63;action=img" method="post" name="imge">      
  <input type="hidden" name="MAX_FILE_SIZE" value="100000000" />
  <input value="导入文件" type="file" name="img" id="file"/><br/><br/>
  <input type="submit" id="imgbut" class="buttons" value="上传图片" />                                          
  </form> 
</div>

php code:

<&#63;php
/**
*Mwbe Version1.0
*-----------------------------------------------
*Copy 2013-2014 ylt
*Web: communicate
*-----------------------------------------------
*Author: tao *Data: 2014-7-22
*/
header("Content-Type:text/html;charset=utf-8");
//step 1 使用$_FILES['pic']["error"] 检查错误
if(isset($_GET["action"])=="img"){
if($_FILES["img"]["error"] > 0){
  switch($_FILES["img"]["error"]) {
  	case 1:
  	  echo "<script type='text/javascript'>alert('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值<br>');history.back();</script>";
  	  break;
  	case 2:
  	  echo "<script type='text/javascript'>alert('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值');history.back();</script>";
  	  break;
  	case 3:
  	  echo "<script type='text/javascript'>alert('文件只有部分被上传');history.back();</script>";
  	  break;
  	case 4:
  	  echo "<script type='text/javascript'>alert('没有文件被上传');history.back();</script>";
  	  break;
  	default:
  	  echo "<script type='text/javascript'>alert('末知错误');history.back();</script>";
  }
  exit;
}
$maxsize=2000000; //50k
//step 2 使用$_FILES["pic"]["size"] 限制大小 单位字节 2M=2000000
if($_FILES["img"]["size"] > $maxsize ) {
  echo "<script type='text/javascript'>alert('上传的文件太大，不能超过{$maxsize}字节');history.back();</script>";
  exit;
}
//step 3 使用$_FILES["pic"]["type"]或是文件的扩展名 限制类型 MIME image/gif image/png  gif png jpg
 /*  list($dl, $xl) = explode("/", $_FILES["pic"]["type"]);
 if($dl!="image"){
 echo "请上传一个图片，不充许其它类型文件";
 exit;
 }
 */
 $allowtype=array("png", "gif", "jpg", "jpeg");
 $arr=explode(".", $_FILES["img"]["name"]);
 $hz=$arr[count($arr)-1];
 if(!in_array($hz, $allowtype)){
 echo "<script type='text/javascript'>alert('这是不允许的类型');history.back();</script>";
		exit;
 }
 //step 4 将让传后的文件名改名
 $filepath="../imgweb/";
 $fileimgweb="imgweb/";//为了符合UBB的路径
	$randname=date("Y").date("m").date("d").date("H").date("i").date("s").rand(100, 999).".".$hz;
	  //将临时位置的文件移动到指定的目录上即可
	  if(is_uploaded_file($_FILES["img"]["tmp_name"])){
	    if(move_uploaded_file($_FILES["img"]["tmp_name"],$filepath.$randname)){
	      echo "<script type='text/javascript'>history.back();</script>";
	      session_start();
	      $_SESSION['images'] = $fileimgweb.$randname;
	      }else{
	      echo "<script type='text/javascript'>alert('上传失败');history.back();</script>";
	      }
	}else{
		echo"<script type='text/javascript'>alert('不是一个上传文件');history.back();</script>";
	}	
}
&#63;>

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