PHP rot5 javascript equalivant? - php

Question

I am wondering if there is a rot5 function for PHP equalivant too
function rot5(str) {
var s = [];
for (i = 0; i < str.length; i ++)
{
idx = str.charCodeAt(i);
if ((idx >= 48) && (idx <= 57))
{
if (idx <= 52)
{
s[i] = String.fromCharCode(((idx + 5)));
}
else
{
s[i] = String.fromCharCode(((idx - 5)));
}
}
else
{
s[i] = String.fromCharCode(idx);
}
}
return s.join('');
}
In javascript? If not then how can I do fromCharCode and charCodeAt in PHP?

Answer 1

Here you got generic strrot with default to strrot5
<?php
function strrot($str, $n=5){
$replace = [];
for($i=0;$i<26;$i++){
$replace[chr(65+$i)] = chr(65+(($i+$n)%26));
$replace[chr(97+$i)] = chr(97+(($i+$n)%26));
}
return strtr($str, $replace);
}

Answer 2

You can use 'ord' for 'charCodeAt'.
ord($yourstring[$yourindex])
You can use 'chr' for 'fromCharCode'
chr($yourcharcode)