<?php class a { function x() { echo 'x' . chr(10); } } class b extends a { function y() { echo 'y' . chr(10); self::x(); $this->x(); } } class c extends b { function z() { echo 'z' . chr(10); self::y(); } function x() { echo 'x2' . chr(10); } } echo (new c)->z();
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