MultiConstraint example

    public static function isSubsetOf(ConstraintInterface $candidate, ConstraintInterface $constraint)
    {
        if ($constraint instanceof MatchAllConstraint) {
            return true;
        }

        if ($candidate instanceof MatchNoneConstraint || $constraint instanceof MatchNoneConstraint) {
            return false;
        }

        $intersectionIntervals = self::get(new MultiConstraint(array($candidate, $constraint), true));
        $candidateIntervals = self::get($candidate);
        if (\count($intersectionIntervals['numeric']) !== \count($candidateIntervals['numeric'])) {
            return false;
        }

        foreach ($intersectionIntervals['numeric'] as $index => $interval) {
            if (!isset($candidateIntervals['numeric'][$index])) {
                return false;
            }

            if ((string) $candidateIntervals['numeric'][$index]->getStart() !== (string) $interval->getStart()) {
                

&& ($left0 = (string) $left->constraints[0])
                    && $left0[0] === '>' && $left0[1] === '='
                    && ($left1 = (string) $left->constraints[1])
                    && $left1[0] === '<'
                    && ($right0 = (string) $right->constraints[0])
                    && $right0[0] === '>' && $right0[1] === '='
                    && ($right1 = (string) $right->constraints[1])
                    && $right1[0] === '<'
                    && substr($left1, 2) === substr($right0, 3)
                ) {
                    $optimized = true;
                    $left = new MultiConstraint(
                        array(
                            $left->constraints[0],
                            $right->constraints[1],
                        ),
                        true);
                } else {
                    $mergedConstraints[] = $left;
                    $left = $right;
                }
            }
            if ($optimized) {
                

foreach ($this->parseConstraint($constraint) as $parsedConstraint) {
                        $constraintObjects[] = $parsedConstraint;
                    }
                }
            } else {
                $constraintObjects = $this->parseConstraint($andConstraints[0]);
            }

            if (1 === \count($constraintObjects)) {
                $constraint = $constraintObjects[0];
            } else {
                $constraint = new MultiConstraint($constraintObjects);
            }

            $orGroups[] = $constraint;
        }

        $constraint = MultiConstraint::create($orGroups, false);

        $constraint->setPrettyString($prettyConstraint);

        return $constraint;
    }