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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function atbashDigit($digit)
{
$result = '';
$digit = trim($digit);
$lenght = strlen($digit);
$max = 10;
for($i = 0; $i<= $lenght; $i++){
if(ctype_digit($digit[$i])){
$num = $digit[$i];
if($num >= 0 && $num <= 9){
$result .= ($max - $num);
}else{
$result .= $input[$i];
}
}
}
return $result;
}
echo atbashDigit('123');