- substr: documentation ( source)
- substr_count: documentation ( source)
- strpos: documentation ( source)
<?php
$ar = ['filename.en_us.srt', 'filename.en_uk.srt'];
foreach($ar as $a)
{
$len = strlen($a);
$dotcount = substr_count($a, '.') -1;
$pos = strpos($a, '.', $dotcount+1);
echo substr($a, $pos, -4) . "\n";
}