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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 8.1.30 - 8.1.33, 8.2.3 - 8.2.29, 8.3.5 - 8.3.27, 8.4.1 - 8.4.16, 8.5.0 - 8.5.1: <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>
Output for 8.3.28: /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28)
Process exited with code 1.

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