<?php declare(strict_types=1); class Foo { public function __set(string $name, int $value): void { $this->{$name} = $value; } } try { $o = new Foo; $o->{'"foo&voilà"'} = '5'; echo implode(', ', array_keys(get_object_vars($o))); } catch (throwable $e) { echo get_class($e); }
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