Как узнать откуда вызвана функция в php?

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<?php

class Example
{
    private $company;

    public function getCompany()
    {
        print_r(debug_backtrace());
        return $this->company;
    }

    public function setCompany($company)
    {
        $this->company = $company;
    }

    public function sayHi()
    {
        $company = $this->getCompany();

        echo $company;
    }
}

$test = new Example();
$test->setCompany("Яндекс");
$test->sayHi();