addphp calculate next letter
$str = 'a';
echo ++$str; // prints 'b'
$str = 'z';
echo ++$str; // prints 'aa'addphp calculate next letter
$str = 'a';
echo ++$str; // prints 'b'
$str = 'z';
echo ++$str; // prints 'aa'Copyright © 2021 Codeinu
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