3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public function __construct( public int $a = 1 ) {} } class B extends A { public function __construct( public string $b = 'hello' ) {} } $b = new B(); var_dump($b->a, $b->b);
Output for 8.1.1 - 8.1.31, 8.2.10 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
Fatal error: Uncaught Error: Typed property A::$a must not be accessed before initialization in /in/kd90M:16 Stack trace: #0 {main} thrown in /in/kd90M on line 16
Process exited with code 255.
Output for 7.2.0 - 7.2.32, 7.3.0 - 7.3.20, 7.4.0 - 7.4.8
Parse error: syntax error, unexpected 'public' (T_PUBLIC), expecting variable (T_VARIABLE) in /in/kd90M on line 5
Process exited with code 255.
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68.92 ms | 407 KiB | 5 Q