<?php
$filename= "1404985656_2014-07-08_12_00__vikerraadio__vikerraadio-uudised__elistvere_loomapark_ootab_öiseid_külastajaid";
$replace = array('ä', 'ü', 'ö', 'õ', ' ', ':' );
$with = array('a', 'y', 'o', '6', '_', '_' );
var_dump(mb_strtolower($filename));
var_dump(mb_strpos('ö',mb_strtolower($filename)));
$filename = str_replace($replace, $with , mb_strtolower($filename));
var_dump($filename);
preferences:
39.06 ms | 402 KiB | 5 Q