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| <?php
abstract class Enum
{
protected $value;
protected static $enumList = [];
public function __construct($enum)
{
$enumClassName = get_called_class();
if (isset(self::$enumList[$enumClassName])) {
$enumList = self::$enumList[$enumClassName];
} else {
$objClass = new \ReflectionClass($enumClassName);
$enumList = $objClass->getConstants();
self::$enumList[$enumClassName] = $enumList;
}
if (!in_array($enum, $enumList, true)) {
throw new Exception('Error Type');
}
$this->value = $enum;
}
public function __set($name, $value)
{
if ($name === 'value') {
$enumClassName = get_called_class();
if (!in_array($value, self::$enumList[$enumClassName], true)) {
throw new Exception('Error Value');
}
$this->value = $value;
} else {
throw new Exception('Error Type');
}
}
public function __get($name)
{
if ($name === 'value') {
return $this->value;
} else {
throw new Exception('Error Type');
}
}
public function __invoke($enum)
{
$enumClassName = get_called_class();
if (!in_array($enum, self::$enumList[$enumClassName], true)) {
throw new Exception('Error Value');
}
$this->value = $enum;
}
}
class Day extends Enum
{
const MON = 'MON';
const TUE = 'TUE';
const WED = 'WED';
const THU = 'THU';
const FRI = 'FRI';
const SAT = 'SAT';
const SUN = 'SUN ';
}
$day = new Day(Day::FRI);
echo $day->value;
try{
$day->value = Day::MON;
} catch(Exception $e){
var_dump($e);
}
try{
$day->value = 'nihao';
} catch(Exception $e){
var_dump($e->getMessage());
}
|