- strtr: documentation ( source)
- var_export: documentation ( source)
- strtoupper: documentation ( source)
- strtolower: documentation ( source)
<?php
$text = <<<TEXT
ir fsncif wcovcp
fwfa abierpmz hbwf rif
irctz ifchj bdrnv
afwrmnvcricufe
nivcm iffemfttmz baabihfe
afwfatfe rivr nt
irx er b iffegnm
efgz erxi fboj tfoafv fba
ani vcm zrn rxi nt
TEXT;
var_export(
strtolower(strtr(
$text,
'fiemtzrwahbpxnscjvduogql',
strtoupper('endlsyovrgamwuqihtbzcfpk')
))
);