Does typing in PHP interfere with an application’s performance?

Question

Out of curiosity, and by using it a lot without knowing if it is necessary, define the type of the variable is something I do in 100% of my code.

It’s usually defined by something like this:

class classe 
{
    private $dado;

    public function dado(int $dado = 1)
    {
        $this->dado = (int) $dado;
        return $this;
    }
}

Or in rare cases where there is no object orientation:

$var = (int) 1;

The question is:

Define types in 100% of code reduces or improves performance ? (even that the gain or loss of performance is negligible)

And a second question is:

It is worth validating the type ?

Example:

class classe 
    {
        private $dado;

        public function dado(int $dado = 1)
        {
            if(is_int($dado) == true)
            {
                $this->dado = (int) $dado;
            }else
            {
                $this->dado = die('Tipo não suportado');
            }     
            return $this;
        }
    }

PS: In the example in question that I’m trying to improve performance is an abstraction layer for building pages with CSS Bootstrap 4 + JS.