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<?php trait TestTrait { public function __construct() { echo "TestTrait::__construct"; } } class TestClass { use TestTrait; public function __construct($a) { echo "TestClass::__construct"; } } new TestClass();
Output for 7.1.0
Fatal error: Uncaught ArgumentCountError: Too few arguments to function TestClass::__construct(), 0 passed in /in/jLPKn on line 21 and exactly 1 expected in /in/jLPKn:15 Stack trace: #0 /in/jLPKn(21): TestClass->__construct() #1 {main} thrown in /in/jLPKn on line 15
Process exited with code 255.
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.0.14
Warning: Missing argument 1 for TestClass::__construct(), called in /in/jLPKn on line 21 and defined in /in/jLPKn on line 15 TestClass::__construct
Output for hhvm-3.12.0
Warning: __construct() expects exactly 1 parameter, 0 given in /in/jLPKn on line 17 TestClass::__construct
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/jLPKn 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/jLPKn on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/jLPKn on line 3
Process exited with code 255.