How to rename file before uploading in PHP?

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// Get the uploaded file's name
$originalName = $_FILES['file']['name'];

// Generate a new file name based on your requirements
// In this example, we will append a timestamp to the original file name
$timestamp = time();
$newName = $timestamp . '_' . $originalName;

// Specify the destination folder where you want to upload the file
$destinationFolder = 'uploads/';

// Combine the destination folder and the new file name
$destinationPath = $destinationFolder . $newName;

// Move and rename the uploaded file to the destination path
if (move_uploaded_file($_FILES['file']['tmp_name'], $destinationPath)) {
    echo 'File renamed and uploaded successfully.';
} else {
    echo 'Unable to upload the file.';
}

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$old_name = "old_file_name.txt";
$new_name = "new_file_name.txt";

if (rename($old_name, $new_name)) {
    echo "File has been renamed.";
} else {
    echo "There was an error renaming the file.";
}

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// Check if a file has been selected for upload
if (!empty($_FILES["uploaded_file"]["name"])) {
    // Get the file extension
    $extension = pathinfo($_FILES["uploaded_file"]["name"], PATHINFO_EXTENSION);

    // Generate a new file name
    $new_file_name = "new_file_name." . $extension;

    // Rename the file
    rename($_FILES["uploaded_file"]["tmp_name"], $new_file_name);

    // Upload the file
    // ...
}