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<?php trait ImmutableFromParams { private $mutable = true; private function __construct(array $params) { var_dump(get_object_vars($this));die; var_dump(array_intersect($params, get_object_vars($this))); die; foreach (array_intersect($params, (get_object_vars($this))) 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 $foo; 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() { return (string) $this->bar; } } $foo = MyValueObject::fromParams(array('foo' => 'foo', 'bar' => 'bar', 'meh' => 'meh')); $foo->setFoo('newfoo'); $foo->setDog('dog'); echo $foo; /* To Do: 1. Throw exception on attempted $foo->setFoo() of DTO. 2. Return new instance on attempted $foo->setFoo() of VO. 3. Implement an equality method for VO. 4. Add guard clause preventing string to array conversion in VO when nested array in $params. 5. Add guard for incomplete $params & throw exception (would require explicit NULLs in $params for permissable NULL values). Notes: - When we want to raise the bar and require all DTOs & VOs to enforce their own validation internally (using private setters), remove __call & references to $mutable from the Trait and limit add check for in_array($param, array_keys(get_object_vars($this)));. */
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { ["mutable"]=> bool(true) ["foo"]=> NULL ["bar"]=> NULL }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
array(3) { ["foo"]=> NULL ["bar"]=> NULL ["mutable"]=> bool(true) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/mDPCS on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/mDPCS on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/mDPCS on line 3
Process exited with code 255.

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