<?php class Point { public function __construct(private int $x, private int $y) {} protected function modClone(...$args): static { $new = clone($this); foreach ($args as $k => $v) { $new->$k = $v; } return $new; } public function moveUp(int $amt) { return $this->modClone(y: $this->y + $amt); } } $p1 = new Point(3, 5); $p2 = $p1->moveUp(4); var_dump($p2);
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