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<?php
namespace Bmatovu\Ussd\Traits;
trait Expressions
{
// Todo - handle decrement below position 1 edge case
protected function decExp(?string $exp, int $step = 1): ?string
if (! $exp) {
return $exp;
}
return preg_replace_callback('|(\d+)(?!.*\d)|', static function ($matches) use ($step) {
return $matches[1] - $step;
}, $exp);
protected function incExp(?string $exp, int $step = 1): string
return $matches[1] + $step;
mtvbrianking /
laravel-ussd
