[PHP-NOTES] note 130313 added to function.get-object-vars

This function is easy way to detect if property initialized:
<?php
class Test
{
    protected ?ArrayObject $data;

    public function getData()
    {
        if (!isset($this->data, get_object_vars($this)['data'])) {
            $this->data = new ArrayObject();
        }
        return $this->data;
    }
}
?>
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Manual Page -- https://php.net/manual/en/function.get-object-vars.php
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