<?php

$text = "j bcr hiv cokt vi kjqpv ih che lcs ig bigz qjyjhq vpt tfcuv
kiuckjve ia vpt ucrvkt ngcuwkc, cr vptgt cgt hi lcsr ia
vpjr uiwhvge cr etv vi uilscgt bjvp iwg ibh lgnchut
rwgyte lcsr; owv j aiwhn vpcv ojrvgjvd, vpt sirv vibh
hcltn oe uiwhv ngcuwkc, jr c acjgke btkk-zhibh skcut.
j rpckk thvtg ptgt rilt ia le hivtr, cr vpte lce gtagtrp le
ltlige bpth j vckz iytg le vgcytkr bjvp ljhc.";

$search = [
'a',
'b',
'c',
'd',
'e',
'f',
'g',
'h',
'i',
'j',
'k',
'l',
'm',
'n',
'o',
'p',
'q',
'r',
's',
't',
'u',
'v',
'w',
'x',
'y',
'z'
];

$replace = [
'F',
'W',
'A',
'd',
'Y',
'f',
'R',
'N',
'O',
'I',
'L',
'l',
'm',
'D',
'B',
'H',
'G',
'S',
's',
'E',
'K',
'T',
'U',
'x',
'y',
'z',
];

echo "\n" . str_replace($search,$replace,$text) . "\n";