Example.php

<?php

class A {
    public static function iAm() {
        return "A";
    }
}
 
// echo A::iAm();  // "A"

class B extends A {
    public static function iAm() {
        echo "I am B. I come from " . parent::iAm();
    }
}

B::iAm(); // "I am B. I come from A"

class C extends B {
    public static function iAm() {
        echo "I am C. I come from " . parent::class . "\n";
    }
    
    public static function iComeFrom() {
        parent::iAm();
    }
}

echo C::iAm(); // "I am C. I come from B"
echo C::iComeFrom(); // "I am B. I come from A"