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<?php trait ImmutableFromParams { private $mutable = true; private function __construct(array $params) { foreach ($params as $key => $value) { $this->{'set' . str_replace(' ', '', ucwords(str_replace('_', ' ', $key)))}($value); } unset($this->mutable); } public static function fromParams(array $params) { return new static($params); } public function __call($method, $args) { if (isset($this->mutable) && substr($method, 0, 3) == 'set' && property_exists($this, lcfirst(substr($method, 3)))) { $this->{lcfirst(substr($method, 3))} = reset($args); } } } interface DataTransferObjectInterface { public static function fromParams(array $params); public function asArray(); } abstract class AbstractDataTransferObject implements DataTransferObjectInterface { use ImmutableFromParams; public function asArray() { return get_object_vars($this); } } final class MyDataTransferObject extends AbstractDataTransferObject { protected $fooBoo; protected $bar; protected function setBar($value) { $this->bar = $value; } } $foo = MyDataTransferObject::fromParams(array('foo' => 'foo', 'bar' => 'bar', 'meh' => 'meh')); $foo->setFoo('newfoo'); $foo->setDog('dog'); var_dump($foo->asArray()); interface ValueObjectInterface { public static function fromParams(array $params); public function __toString(); } abstract class AbstractValueObject implements ValueObjectInterface { use ImmutableFromParams; abstract public function __toString(); } final class MyValueObject extends AbstractValueObject { protected $bar; protected function setBar($value) { $this->bar = $value; } public function __toString() { echo $bar; } } $foo = MyValueObject::fromParams(array('foo' => 'foo', 'bar' => 'bar', 'meh' => 'meh')); $foo->setFoo('newfoo'); $foo->setDog('dog'); echo $foo;
based on t4trd
Output for 7.1.0
array(2) { ["fooBoo"]=> NULL ["bar"]=> string(3) "bar" } Notice: Undefined variable: bar in /in/B2Z0P on line 91 Recoverable fatal error: Method MyValueObject::__toString() must return a string value in /in/B2Z0P on line 100
Process exited with code 255.
Output for 5.4.0 - 7.0.14
array(2) { ["fooBoo"]=> NULL ["bar"]=> string(3) "bar" } Notice: Undefined variable: bar in /in/B2Z0P on line 91 Catchable fatal error: Method MyValueObject::__toString() must return a string value in /in/B2Z0P on line 100
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/B2Z0P on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/B2Z0P on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/B2Z0P on line 3
Process exited with code 255.