File Handling: Changing file names on the fly

[Guardian-Mage]

I have this basic file upload script:

<?php
if (($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/pjpeg")
&& ($_FILES["file"]["size"] < 20000))
  {
  if ($_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("upload/" . $_FILES["file"]["name"]))
      {
      echo $_FILES["file"]["name"] . " already exists. ";
      }
    else
      {
      move_uploaded_file($_FILES["file"]["tmp_name"],
      "upload/" . $_FILES["file"]["name"]);
      echo "Stored in: " . "upload/" . $_FILES["file"]["name"] . "<br />
  <img scr=\"upload/" . $_FILES["file"]["name"] . "\" alt=\"Hello World\" />" ;
      }
    }
  }
else
  {
  echo "Invalid file";
  }
?>

 

I need to have my script rename the file if it already exists, like add a number to it until it is ok. How do i do this?

[s0c0]

You can try creating a function that gets called if the file exists.  The function would then use the rand function to append a random number on the end of the file name.

 

The function would look something like this:

 

function randomName()

{

    $randNum = rand(1,100000); // returns random number between 1 and 100,000

    $_FILES["file"]["name"] = $_FILES["file"]["name"].$randNum;

    return $_FILES["file"]["name"];

    Go();

}

 

Ofcourse you would have to put your existing code into a function, so in the end it would look something like this:

 

function Go ($uploadFile)

{

// your existing code in here

 

// if file exists then call randomFile()

}

 

Not sure if that will work and none of that code has been tested, but give it a shot.

[Guardian-Mage]

Thank you very much, the code works fine.

 

-Brandon