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December 16, 2016 08:00
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Type safe enum implementation in PHP
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| <?php | |
| abstract class Enum { | |
| protected $value; | |
| public function getValue() | |
| { | |
| return $this->value; | |
| } | |
| private function __construct($name, $childClass) | |
| { | |
| $constant = "$childClass::$name"; | |
| if (defined($constant)) { | |
| $this->value = constant($constant); | |
| } else { | |
| throw new \InvalidStateException($name . ' is not valid option for ' . $childClass); | |
| } | |
| } | |
| public function __toString() { | |
| return $this->value; | |
| } | |
| public static function __callStatic($name, $params) | |
| { | |
| $childClass = get_called_class(); | |
| return new $childClass($name, $childClass); | |
| } | |
| } | |
| // Example usage: | |
| class Family extends Enum { | |
| const | |
| FATHER = 'father', | |
| MOTHER = 'mother', | |
| BROTHER = 'brother', | |
| SISTER = 'sister'; | |
| } | |
| $member = Family::FATHER(); |
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