Php regex file extension

$fileName = 'banner.jpg';

$ext = end(explode('.', $fileName));
$ext = substr(strrchr($fileName, '.'), 1);
$ext = substr($fileName, strrpos($fileName, '.') + 1);
$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $fileName);
$ext = pathinfo($fileName, PATHINFO_EXTENSION);

Source: techieroop.com

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