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<?php function assign_foo($instance) { $instance->foo = 2; } final class Content { protected $data; public function __get(string $name) { return $this->data[$name]; } public function __set(string $name, mixed $value): void { if ($value === 1) { assign_foo($this); } else { $this->data[$name] = $value; } } } $content = new Content(); $content->foo = 1;
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Creation of dynamic property Content::$foo is deprecated in /in/smIKL on line 4

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