<?php interface I { public $x { get; } } class C implements I { private $_x; public $x { get => $this->_x; } } var_dump((new ReflectionProperty(C::class, 'x'))->isVirtual()); // should be: bool(true) $c = new C; $c->x = 3; // should throw an error: 'Property C::$x is read-only'
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Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).