Php upload script with namechange

[brianzet]

Hello all.

I've got this upload script, working just fine.

<?php 
error_reporting(0);

$change="";
$abc="";


 define ("MAX_SIZE","400");
 function getExtension($str) {
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
 }

 $errors=0;
  
 if($_SERVER["REQUEST_METHOD"] == "POST")
 {
 	$image =$_FILES["file"]["name"];
	$uploadedfile = $_FILES['file']['tmp_name'];
     
 
 	if ($image) 
 	{
 	
 		$filename = stripslashes($_FILES['file']['name']);
 	
  		$extension = getExtension($filename);
 		$extension = strtolower($extension);
		
		
 if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) 
 		{
		
 			$change='<div class="msgdiv">Ukendt fil format.</div> ';
 			$errors=1;
 		}
 		else
 		{

 $size=filesize($_FILES['file']['tmp_name']);


if ($size > MAX_SIZE*1024)
{
	$change='<div class="msgdiv">Du har overskredet fil st&oslash;rrelsen!</div> ';
	$errors=1;
}


if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);

}
else if($extension=="png")
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);

}
else 
{
$src = imagecreatefromgif($uploadedfile);
}

echo $scr;

list($width,$height)=getimagesize($uploadedfile);


$newwidth=400;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);


$newwidth1=193;
$newheight1=143;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);

imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);


$filename = "user_imgs/". $_FILES['file']['name'];

$filename1 = "user_imgs/thumbs/small". $_FILES['file']['name'];



imagejpeg($tmp,$filename,100);

imagejpeg($tmp1,$filename1,100);

imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}}

}

//If no errors registred, print the success message
 if(isset($_POST['Submit']) && !$errors) 
 {
 
   // mysql_query("update {$prefix}users set img='$big',img_small='$small' where user_id='$user'");
 	$change=' <div class="msgdiv">Billedet blev uploadet succesfuldt!</div>';
 }
 
?>

Problem is, when I upload 2 different images, but with the same file name, one of the images overwrites the other, I dont want that.

Can anyone help me how to generate a random name for each picture that is getting upload, so that no images contains the same file name?

Thanks in advance.
Brian.

[Atli]

Hey.

You can use the uniqid and mt_rand functions to generate a unique string of numbers and letters that you can add to the image name.

$unique = uniqid(mt_rand());
$filename = "user_imgs/{$unique}_{$_FILES['file']['name']}";
$filename1 = "user_imgs/thumbs/{$unique}_small{$_FILES['file']['name']}";