I cant figure out how to rename a filename inside the file upload script that I have. 

Any help is really appreciated!! 

Below is the script I am working on.

```
<?php
$target_dir = "../user_profile_pictures/";
$target_file = $target_dir . basename($_FILES["profile_pic"]["name"]);
$uploadOk = 1;
$imageFileType  = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if file already exists
if (file_exists($target_file)) {
    echo "Lo siento, el archivo ya existe.";
    $uploadOk = 0;
}

// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "jpeg" && $imageFileType !=     "png") {
    echo "Lo siento, solo se permiten imagenes tipo jpg, jpeg o png.";
$uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Lo siento, el imagen no se ha subido.";

    // if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["profile_pic"]["tmp_name"], $target_file)) {
        echo "El imagen ". basename( $_FILES["profile_pic"]["name"]). " se ha subido.";
    } else {
        echo "Ha habido un error al subir el archivo.";
    }
}
?>

```