PHPファイルアップロードの例添付詳細

<?php
/*****************************************
Title :      
Author:leehui1983(   )
Finish Date :2006-12-28
*****************************************/
$uploaddir = "./files/";//             /
$type=array("jpg","gif","bmp","jpeg","png");//           
$patch="http://127.0.0.1/cr_downloadphp/upload/files/";//      

//         
function fileext($filename)
{
return substr(strrchr($filename, '.'), 1);
}
//         
function random($length)
{
$hash = 'CR-';
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++)
{
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
$a=strtolower(fileext($_FILES['file']['name']));
//      
if(!in_array(strtolower(fileext($_FILES['file']['name'])),$type))
{
$text=implode(",",$type);
echo "           : ",$text,"<br>";
}
//          
else{
$filename=explode(".",$_FILES['file']['name']);
do
{
$filename[0]=random(10); //       
$name=implode(".",$filename);
//$name1=$name.".Mcncc";
$uploadfile=$uploaddir.$name;
}
while(file_exists($uploadfile));
if (move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile)){

if(is_uploaded_file($_FILES['file']['tmp_name'])){
//      
echo "<center>                 : </center><br><center><img src='$uploadfile'></center>";
echo"<br><center><a href='javascript:history.go(-1)'>    </a></center>";
}
else{
echo "    ！";
}
}
}
?>