<?php
interface proxy {}
trait assertFinal
{
private function assertFinal()
{
if (is_subclass_of($this, __CLASS__, false) && !$this instanceof proxy) {
throw new \Exception('Nein! Class is final!');
}
}
}
class finalfoo
{
use assertFinal;
public function __construct()
{
$this->assertFinal();
}
}
class fooproxy extends finalfoo implements proxy
{
}
class naughtyfoo extends finalfoo
{
}
echo "new finalfoo: "; try {new finalfoo; echo "yes";} catch (\Exception $e) { echo "no"; } echo "\n";
echo "new fooproxy: "; try {new fooproxy; echo "yes";} catch (\Exception $e) { echo "no"; } echo "\n";
echo "new naughtyfoo: "; try {new naughtyfoo; echo "yes";} catch (\Exception $e) { echo "no"; } echo "\n";
- Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- new finalfoo: yes
new fooproxy: yes
new naughtyfoo: no
preferences:
218.4 ms | 404 KiB | 330 Q