Clash Royale CLAN TAG

How to adjust this script to use Glob instead of 1 file

I have created this script based on reading other posts on StackOverflow. The script creates a thumbnail from the original image and adds it to a folder. The source images are located on my local server so Glob would work however I am not sure how to adjust this script so that it will run this function on all files in a folder (Glob). I realize it may be memory intensive but I only need to do it a few times on several folders and I'll be done with it.

Just in case you are questioning the reason I have included $height2, it is a little hack I came up with where we create the thumbnail while maintaining the aspect ratio then only save the top 250px so that the thumb is 250 x 250 but not distorted (stretched). It works great.

I just need to adjust to do a batch of all images in the source folder.

Any help would be great. Please keep in mind that I am a front end developer (html and css) and not great at PHP. This script alone took me forever to make work lol.

If anyone can help me adjust it for a full folder, that would be great.

Thumbnail ("PathToFullSizeImages/.jpg", "OutputFolder/.jpg");
function Thumbnail($url, $filename, $width = 250, $height = true, $height2 = 250) {
$image = ImageCreateFromString(file_get_contents($url));
$height = $height === true ? (ImageSY($image) * $width / ImageSX($image)) : $height;
$output = ImageCreateTrueColor($width, $height2);
ImageCopyResampled($output, $image, 0, 0, 0, 0, $width, $height, ImageSX($image), ImageSY($image));
ImageJPEG($output, $filename, 100);

Thumbnail ("PathToFullSizeImages/.jpg", "OutputFolder/.jpg");
function Thumbnail($url, $filename, $width = 250, $height = true, $height2 = 250) {
$image = ImageCreateFromString(file_get_contents($url));
$height = $height === true ? (ImageSY($image) * $width / ImageSX($image)) : $height;
$output = ImageCreateTrueColor($width, $height2);
ImageCopyResampled($output, $image, 0, 0, 0, 0, $width, $height, ImageSX($image), ImageSY($image));
ImageJPEG($output, $filename, 100);

glob()

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