self

<?php 
class MyObject {
    function myBaseMethod() {
        echo "I am declared in MyObject
";
    }
}

class MyOtherObject extends MyObject {
    function myExtendedMethod() {
        echo "myExtendedMethod is declared in MyOtherObject
";
        self::myBaseMethod();
    }
}

MyOtherObject::myExtendedMethod();
//myExtendedMethod is declared in MyOtherObject 
//I am declared in MyObject