- is_subclass_of: documentation ( source)
- trigger_error: documentation ( source)
<?php
interface proxy {}
trait assertFinal
{
private function assertFinal()
{
if (is_subclass_of($this, __CLASS__, false) && !$this instanceof proxy) {
trigger_error('Nein! Class is final!', E_USER_NOTICE);
}
}
}
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";