How Can I Add A Random Name To Images Being Uploaded To My Website?

[Ken_Turner]

so I'm in the process of making a .gif uploading website, and this is my code for "upload_file.php".

 <?php
$allowedExts = array("jpg", "jpeg", "gif", "png");
$extension = end(explode(".", $_FILES["file"]["name"]));
if ((($_FILES["file"]["type"] == "image/gif"))
&& ($_FILES["file"]["size"] < 5242880)
&& in_array($extension, $allowedExts))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";

if (file_exists("i/" . $_FILES["file"]["name"]))
 {
 echo $_FILES["file"]["name"] . " already exists. ";
 }
else
 {
 move_uploaded_file($_FILES["file"]["tmp_name"],
 "i/" . $_FILES["file"]["name"]);
 echo "Stored in: " . "i/" . $_FILES["file"]["name"];
 }
}
}
else
{
echo "Invalid file";
}
?>

How can I add a random image name? Preferably 6-8 digits of only #0-9. That way the image name is simple instead of being specific to capital letters etc. Please be as specific with directions as possible, because I'm still learning PHP, and that's one of the main reasons I'm making this website.

 

 

P.S. Bonus points if you can tell me how to redirect straight to the image without the page that shows the file info.

[Pikachu2000]

When you move_uploaded_file(), you could append/prepend a value generated by uniqid to the file name.

[Ken_Turner]

When you move_uploaded_file(), you could append/prepend a value generated by uniqid to the file name.

 

But is there a way without having a bunch of digits? I want it to be simpler and short.

[Pikachu2000]

The shorter it is, the higher the likelihood of a duplicate file name is, but I suppose you could use rand instead.

[Ken_Turner]

The shorter it is, the higher the likelihood of a duplicate file name is, but I suppose you could use rand instead.

 

Could I make it search for that name, then possibly rename if it's taken?

[Pikachu2000]

Sure. That shouldn't be too hard with a conditional using file_exists.