Cloning with arguments

clone-args.php

<?php

class Point {
    public initonly int $area;

    public function __construct(
        public initonly int $x,
        public initonly int $y,
        private initonly string $label,
    ) {
        $this->area = $this->x * $this->y;
    }

    // This is super clumsy.
    public function __clone(?int $x = null, ?int $y = null, ?string $label = null) {
        if ($x) $this->x = $x;
        if ($y) $this->y = $y;
        if ($label) $this->label = $label;
        $this->area = $this->x * $this->y;        
    }

    // This is also super clumsy.
    public function __clone(...$args) {
        foreach ($args as $k => $v) {
          if (in_array(needle: $key, haystack: ['x', 'y', 'label']) {
              $this->k = $v;
          }
        }
        if ($x) $this->x = $x;
        if ($y) $this->y = $y;
        if ($label) $this->label = $label;
        $this->area = $this->x * $this->y;        
    }

    public function label() { return $this->label; }

    public function withLabel(string $label) { return clone($this, label: $label); }
}

$p1 = new Point(4, 5, "Mine");
$p2 = clone($p1, x: 10);
$p3 = $p2->withLabel("Yours");