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run code in 150+ php & hhvm versions
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<?php trait ImmutableFromParams { private $mutable = true; private function __construct(array $params) { foreach (array_intersect($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)));. */
based on ghi2n
Output for 5.4.0 - 5.4.34
Parse error: syntax error, unexpected 'as' (T_AS) in /in/iNWXg on line 9
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/iNWXg 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/iNWXg on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/iNWXg on line 3
Process exited with code 255.