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<?php final class CanNotSetProperties extends BadMethodCallException { public function __construct($message) { parent::__construct($message); } public function exception($message) { return new static($message); } } final class ConstructorIsVisible extends BadMethodCallException { public function __construct($message) { parent::__construct($message); } public function exception($message) { return new static($message); } } trait Immutable { public function __set($property, $value) { throw CanNotSetProperties::exception(); } protected function __construct() { throw ConstructorIsVisible::exception(); } } final class Test { use Immutable; public function __construct() { echo 'hello'; } } $test = new Test; $test->__construct();
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
hellohello
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/CEqLT on line 29
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/CEqLT on line 12
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/CEqLT on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/CEqLT 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
Parse error: parse error, unexpected T_CLASS in /in/CEqLT on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/CEqLT on line 3
Process exited with code 255.

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