I am really struggling to firgure out how to create an image upload script that uploads an image an gives it a random name say the file was "image.jpg" - It would change it to something like "938765.jpg".

 

Can someone please edit my upload script so this happens and if possible explain what it is that makes it happen, thank you.

 

<?
$uploaddir = "companylogo";
$allowed_ext = "jpg, jpeg, png, png, bmp, gif"; 
$max_size = "10000";
$max_height = "100";
$max_width = "30"; 
$extension = pathinfo($_FILES['file']['name']);
$extension = $extension[extension];
$allowed_paths = explode(", ", $allowed_ext);
for($i = 0; $i < count($allowed_paths); $i++) {
if ($allowed_paths[$i] == "$extension") {
$ok = "1";
}
}
if ($ok == "1") {
if($_FILES['file']['size'] > $max_size)
{
print "File size is too big";
exit;
}
if(is_uploaded_file($_FILES['file']['tmp_name']))
{
move_uploaded_file($_FILES['file']['tmp_name'],$uploaddir.'/'.$_FILES['file']['name']);
}
echo '<div align="left"><div id="indent">Your logo has been uploaded successfully, 
<a href="' .$uploaddir.'/'.$_FILES['file']['name'] .'">Click here to view.</a></div></div>';
} else {
print 'Please select a valid file.';
}
?>

When I want to create a completely random string I always use a current timestamp as an encryption key. This means that the string can never be repeated, in short:

 

$random = md5(time().uniqid());

 

Your script:

 

<?
$uploaddir = "companylogo";
$allowed_ext = "jpg, jpeg, png, png, bmp, gif"; 
$max_size = "10000";
$max_height = "100";
$max_width = "30"; 
$extension = pathinfo($_FILES['file']['name']);
$extension = $extension[extension];
$allowed_paths = explode(", ", $allowed_ext);
for($i = 0; $i < count($allowed_paths); $i++) {
if ($allowed_paths[$i] == "$extension") {
$ok = "1";
}
}
if ($ok == "1") {
if($_FILES['file']['size'] > $max_size)
{
print "File size is too big";
exit;
}
if(is_uploaded_file($_FILES['file']['tmp_name']))
{

/// we'd need to get the extension

$ext = pathinfo($_FILES['file']['name']);
$ext = $ext['extension'];

$random_filename = md5(time().uniqid());

move_uploaded_file($_FILES['file']['tmp_name'],$uploaddir.'/'.$random_filename.".".$ext);
}
echo '<div align="left"><div id="indent">Your logo has been uploaded successfully, 
<a href="' .$uploaddir.'/'.$_FILES['file']['name'] .'">Click here to view.</a></div></div>';
} else {
print 'Please select a valid file.';
}
?>

Thankyou

Make sure you test, I wrote all that freehand

Yeeah I have, the 'click here to view' didn't have the randomised link in so I did this:

 

echo '<div align="left"><div id="indent">Your logo has been uploaded successfully, <a href="' .$uploaddir.'/' . $random_filename . '.' . $ext . '">Click here to view.</a></div></div>';

 

Works perfect!