How Can I Rename Uploaded Files to Random Numbers Before Saving in PHP?

Renaming Uploaded Files Before Saving to a Directory

Question:

In an existing PHP script for uploading files to a directory, is it possible to change the file name to a random number before saving it? The move_uploaded_file() function seems to set the file name, but its current behavior is not desired.

Answer:

To rename the uploaded file to a random number, make an adjustment to the move_uploaded_file() function's second parameter. Instead of using the original file name, generate a new file name using a random number and append the file extension.

Code Modification:

// Get the file extension
$temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);

// Generate a new file name based on the current time
$newfilename = round(microtime(true)) . '.' . $extension;

// Save the file with the new file name
move_uploaded_file($_FILES["file"]["tmp_name"], "../img/imageDirectory/" . $newfilename);

Explanation:

The round(microtime(true)) function generates a random number with a high precision based on the current time. Appending the file extension ensures that the new file name retains the original file type. By using $newfilename in place of $_FILES"file" in the move_uploaded_file() function, the file will be saved with the renamed random number as its file name.

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