How to reference private methods internally in php

How PHP refers to private methods internally: When calling the [get()] method, add [$this] in front, the code is [$con = $this->get($name, $age);echo "my name is :".$name."
";].

How php refers to private methods internally:

This code is very simple, I want to implement the class Internal private method calls. As shown in line 4. I was used to writing JS in the past. When calling the get() method, if I didn't add "$this" in front, the program would have problems. After filling it in, you can call it.

<?php
class Person {
    public function say($name, $age) {
        $con = $this->get($name, $age); //这里的$this->是关键
        echo "my name is :".$name."<br />";
        echo "my age is :".$age."<br/>";
        echo "get :".$con."<br/>";
    }
    private function get($a, $b) {
        $a = $a.$b;
        return $a;
    }
}
$person=new Person();
$person->say("ren", 25);
?>

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