php class Worker private name age salary public function setName strin

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<?php
class Worker
{
private $name, $age, $salary;
public function setName(string $name)
{
$this->name = $name;
return $this;
}
public function getName(): string
{
return $this->name;
}
public function setAge(int $age)
{
if ($this->checkAge($age)) {
$this->age = $age;
}
return $this;
}
public function getAge(): string
{
return $this->age;
}
public function setSalary(int $salary)
{
$this->salary = $salary;
return $this;
}
public function getSalary(): int
{
return $this->salary;
}
private function checkAge($age): bool
{
return $age >= 1 && $age <= 100;
}
public function showInfo()
{
echo $this->name . " " . $this->age . '<br>';
}
}
$ivan = new Worker();
$ivan->setAge('25')->setName('Иван')->setSalary('1000');
$vasiliy = new Worker();
$vasiliy->setAge('26')->setName('Вася')->setSalary('2000');
$workersSalary = $ivan->getSalary() + $vasiliy->getSalary();
echo $workersSalary . '<br>';
$workersAge = $ivan->getAge() + $vasiliy->getAge();
echo $workersAge . '<br>';
$ivan->showInfo();
$vasiliy->showInfo();