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<?php interface PolicyRule { public function isSatisfiedBy(string $aValue); } abstract class EnforcedRule implements PolicyRule { const UNENFORCED = 0; const ENFORCED = 1; private $enforcementType; protected function isEnforced() : bool { return ($this->enforcementType == self::ENFORCED); } protected function setEnforcementType(int $aType) { $this->guardEnforcementType($aType); $this->enforcementType = $aType; } protected function guardEnforcementType(int $aType) { if (! in_array($aType, [self::UNENFORCED, self::ENFORCED])) { throw new InvalidEnforcementTypeException($aType); } } } abstract class MinimumCharacterCountRule extends EnforcedRule { const DEFAULT_MINIMUM = 1; protected $regexPattern; protected $minimumCount = self::DEFAULT_MINIMUM; public function isSatisfiedBy(string $aValue) : bool { if (! $this->isEnforced()) { return true; } $matches = []; preg_match_all($this->regexPattern, $aValue, $matches); return (count($matches[0]) >= $this->minimumCount); } } class NumericRule extends MinimumCharacterCountRule { protected $regexPattern = '/[0-9]/'; public function __construct(int $aMinimumCount = self::DEFAULT_MINIMUM, int $anEnforcementType = self::ENFORCED) { $this->setEnforcementType($anEnforcementType); $this->minimumCount = $aMinimumCount; } } class SpecialCharacterRule extends MinimumCharacterCountRule { protected $regexPattern = '/[~`#\$%\^&\*\-_\+\|,\.<>]/'; public function __construct(int $aMinimumCount = self::DEFAULT_MINIMUM, int $anEnforcementType = self::ENFORCED) { $this->setEnforcementType($anEnforcementType); $this->minimumCount = $aMinimumCount; } } $numeric = new NumericRule(); var_dump($numeric->isSatisfiedBy("for5")); $special = new SpecialCharacterRule(); var_dump($special->isSatisfiedBy("for5"));