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@ 2023-02-18T14:12:20Z

<?php

class Thing {
    public function __construct(
        public readonly string $name,
        public readonly ?Thing $left = null,
        public readonly ?Thing $right = null,
    ) {
        
    }
    public function hasThings(): bool {
        return  $this->left || $this->right;
    }
    public function getThingDepth(): int{
        if(!$this->hasThings()) {
            return 1;
        }
        return max($this->left->getThingDepth(), $this->right->getThingDepth()) + 1;
    }
    public function getHtml(): string {
        $buf = [];
        $buf[] = '<table>';
        $buf[] = '<tr>';
        $buf[] = '<td>';
        $buf[] = $this->name;
        $buf[] = '</td>';
        if($this->hasThings()){
            $buf[] = '<td>';
            $buf[] = $this?->left->getHtml() ?? '-';
            $buf[] = $this?->right->getHtml() ?? '-';
            $buf[] = '</td>';
        }
        $buf[] = '</tr>';
        $buf[] = '</table>';
        
        return implode("\n", $buf);
    }
}

$me = new Thing(
    'Child',
    new Thing('Dad', new Thing('Dad\'s dad'), new Thing('Dad\'s mom')),
    new Thing('Mom', new Thing('Mom\'s dad'), new Thing('Mom\'s mom')),
);

echo $me->getHtml();

Output for git.master_jit, git.master: <table> <tr> <td> Child </td> <td> <table> <tr> <td> Dad </td> <td> <table> <tr> <td> Dad's dad </td> </tr> </table> <table> <tr> <td> Dad's mom </td> </tr> </table> </td> </tr> </table> <table> <tr> <td> Mom </td> <td> <table> <tr> <td> Mom's dad </td> </tr> </table> <table> <tr> <td> Mom's mom </td> </tr> </table> </td> </tr> </table> </td> </tr> </table>

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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