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<?php
$fileName = 'banner.jpg';
$ext = pathinfo($fileName, PATHINFO_EXTENSION);
echo $ext;
?>
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function getExtension(filename) {
return filename.substring(filename.lastIndexOf(".") + 1);
}
let filename = "main.config.js";
let extension = getExtension(filename);
console.log(extension); // "js"
let photoname = "photo.jpg";
let photoExtension = getExtension(photoname);
console.log(photoExtension); // "jpg"