<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title of the document</title>
</head>

<body>

<form method="post" enctype="multipart/form-data">
    <input name="upload[]" type="file" multiple="multiple" />
    <button type="submit" name="btn-upload">upload</button>
</form>

<?php
    //$files = array_filter($_FILES[\'upload\'][\'name\']); something like that to be used before processing files.
    // Count # of uploaded files in array
    $total = count($_FILES[\'upload\'][\'name\']);

    // Loop through each file
    for($i=0; $i < $total; $i++)
    {
        //Get the temp file path
        $tmpFilePath = $_FILES[\'upload\'][\'tmp_name\'][$i];

        //Make sure we have a filepath
        if ($tmpFilePath != ""){
            //Setup our new file path
            $newFilePath = "./uploadFiles/" . $_FILES[\'upload\'][\'name\'][$i];

            //Upload the file into the temp dir
            if(move_uploaded_file($tmpFilePath, $newFilePath)) {
            //Handle other code here
            }
        }
    }
?>

</body>
</html>