<?php
$replaceTable = [
'A' => 'Z',
'B' => 'Y',
'C' => 'X',
'D' => 'W',
'E' => 'V',
'F' => 'O',
'G' => 'P',
'H' => 'Q',
'I' => 'R',
'J' => 'S',
'K' => 'T',
'L' => 'U',
'M' => 'N',
'N' => 'M',
'O' => 'L',
'P' => 'K',
'Q' => 'J',
'R' => 'I',
'S' => 'H',
'T' => 'G',
'U' => 'F',
'V' => 'E',
'W' => 'D',
'X' => 'C',
'Y' => 'B',
'Z' => 'A'
];
$string = "HelloWorld";
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