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<?php class A { public $a; public function __construct( $a = 1 ) { $this->a = $a; } } class B extends A { public function __construct( public string $b = 'hello' ) {} } $b = new B(); var_dump($b->a, $b->b);
Output for 8.0.30, 8.1.23 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
NULL string(5) "hello"
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 NULL string(5) "hello"
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/HM5s0 on line 15
Process exited with code 255.

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