- strpos: documentation ( source)
- preg_split: documentation ( source)
<?php
$path = '/a/b/c/d/e.f';
$matches = [];
$matches = preg_split('/\/|\\\/', $path);
$filename = $matches[count($matches) - 1];
echo strpos('.', $filename);
if(strpos('.', $filename) !== -1) {}