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<?php interface PolicyRule { public function isSatisfiedBy(); } abstract class EnforcedRule implements PolicyRule { const TYPE_NO = 'No'; const TYPE_YES = 'Yes'; protected $enforcementType; protected function isEnforced() { return ($this->enforcementType == self::TYPE_YES); } protected function guardEnforcementType($aType) { if (! in_array($aType, [self::TYPE_NO, self::TYPE_YES])) { throw new InvalidEnforcementTypeException($aType); } } } abstract class MinimumCharacterCountRule extends EnforcedRule { const DEFAULT_MINIMUM = 1; protected $regexPattern; protected $minimumCount = self::DEFAULT_MINIMUM; public function isSatisfiedBy($aValue) { if (! $this->isEnforced()) { return true; } $matches = []; preg_match_all($this->regexPattern, $aValue, $matches); return (count($matches[0]) >= $this->minimumCount); } } class NumericRule extends MinimumCharacterCountRule { protected $regexPattern = '/[0-9]/'; public function __construct($aMinimumCount = self::DEFAULT_MINIMUM) { $this->minimumCount = $aMinimumCount; } } class SpecialCharacterRule extends MinimumCharacterCountRule { protected $regexPattern = '/[~`#\$%\^&\*\-_\+\|,\.<>]/'; public function __construct($aMinimumCount = self::DEFAULT_MINIMUM) { $this->minimumCount = $aMinimumCount; } } $numeric = new NumericRule(); var_dump($numeric->isSatisfiedBy("for5"));