I have a function
function haqSliderHandleUpload() {
global $haq_settings, $haqSliderImage;
// upload the image
$sliderfile = $_FILES['haq_slider'];
$upload = wp_handle_upload($sliderfile, 0);
extract($upload);
$uploadDirPath = str_replace(basename($file), '', $url);
list($imageWidth, $imageHeight) = getimagesize($file); }
I want to SANITIZE this field $sliderfile = $_FILES['haq_slider']; How can i do it