php rename uploaded file before upload and overwrite if already exists - php

Question

Currently using this code for the upload (but happy to use any if suggested)..
<form style="margin-bottom:2px;" method="post" enctype="multipart/form-data" name="formUploadFile">
<label>Select CSV file to upload:</label>
<input type="file" name="files[]" multiple="multiple" /> <input type="submit" value="Upload CSV" name="btnSubmit"/>
</form>
<?php
if(isset($_POST["btnSubmit"]))
{
$errors = array();
$uploadedFiles = array();
$extension = array("csv");
$bytes = 1024;
$KB = 1024;
$totalBytes = $bytes * $KB;
$UploadFolder = "tmp_csv_store";
$counter = 0;
foreach($_FILES["files"]["tmp_name"] as $key=>$tmp_name){
$temp = $_FILES["files"]["tmp_name"][$key];
$name = $_FILES["files"]["name"][$key];
if(empty($temp))
{
break;
}
$counter++;
$UploadOk = true;
if($_FILES["files"]["size"][$key] > $totalBytes)
{
$UploadOk = false;
array_push($errors, $name." file size is larger than the 1 MB.");
}
$ext = pathinfo($name, PATHINFO_EXTENSION);
if(in_array($ext, $extension) == false){
$UploadOk = false;
array_push($errors, $name." invalid file type.");
}
if(file_exists($UploadFolder."/".$name) == true){
$UploadOk = false;
array_push($errors, $name." file already exists.");
}
if($UploadOk == true){
move_uploaded_file($temp,$UploadFolder."/".$name);
array_push($uploadedFiles, $name);
}
}
if($counter>0){
if(count($errors)>0)
{
echo "<b>Errors:</b>";
foreach($errors as $error)
{
echo " ".$error.",";
}
echo "<br/>";
}
if(count($uploadedFiles)>0){
echo "<b>Uploaded:</b>";
echo "=";
foreach($uploadedFiles as $fileName)
{
echo " ".$fileName.",";
}
echo "<br/>";
echo "<big><big>".count($uploadedFiles)." file has been successfully uploaded.</big></big>";
}
}
else{
echo "ERROR: Please press the browse button and select a CSV file to upload.";
}
}
?>
And would like to modify it so that it renames the uploaded file from "any-file-name.csv" to "foobar.csv" before it uploads the file and it should also overwrite the file if it already exists.
As a bonus the code currently allows for multi-file upload but I really only need it for a single file each time so it could also possibly be shortened a bit if changed to only allow a single file.
Thanks in advance :-)

Answer 1

To add your custom name:
if($UploadOk == true){
$name = "foobar.csv";
move_uploaded_file($temp,$UploadFolder."/".$name);
array_push($uploadedFiles, $name);
}
For single file, remove multiple="multiple":
<input type="file" name="files[]" />