Instance variable type checking needed?

example.php

<?php

class Example
{
    public $number;
    public $text;
    
    public function __construct(int $number, string $text)
    {
        $this->number = $number;
        $this->text = $text;
    }
    
    public function text(): string
    {
        return $this->text;
    }
    
    public function number(): int
    {
        return $this->number;
    }
}