padR
This method repeatedly adds a character to the right of the string until the specified length is reached. If the string is equal to or greater than the target length, nothing is changed.
Usage
$string = 'abc123';
$string = SM::padR($string, 8, 'z');
// or
$string = SM::make($string)
->padR(8, 'z');
echo $string; // abc123zz