[Sanitize File Names WordPress]

I recently submitted a plugin to WordPress and they told me to sanitize my file name here is the examples they gave me. 

 

Quote

basename is great, but you also want to sanitize the filenames

image-framer/image-framer.php:135: $targetFile = $targetPath . '/imageframer/' . basename($_FILES['image']['name'][$i]);
image-framer/image-framer.php:138: $returnResponse[$i] = $dir['baseurl'] . '/imageframer/' . $_FILES['image']['name'][$i];
image-framer/image-framer.php:162: $targetFile = $targetPath . '/imageframer/' . basename($_FILES['uploadimg']['name']);
image-framer/image-framer.php:165: $returnResponse = $dir['baseurl'] . '/imageframer/' . $_FILES['uploadimg']['name'];
image-framer/src/Validation.php:13: $imageFileType = strtolower(pathinfo($targetPath . '/imageframer/' . basename($_FILES['image']['name'][$index]), PATHINFO_EXTENSION));

How would I go about sanitizing file names? Thanks all for your help.