<?php class C { public $untyped; public string $typed; } $c = new C; var_dump( isset( $c->untyped ) ); // false var_dump( isset( $c->typed ) ); // false var_dump( $c->untyped ); // NULL //var_dump( $c->typed ); // Fatal error: Typed property C::$typed must not be accessed before initialization
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