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@ 2015-11-11T14:01:28Z

<?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";

Output for git.master, git.master_jit, rfc.property-hooks: new finalfoo: yes new fooproxy: yes new naughtyfoo: Notice: Nein! Class is final! in /in/HUYkX on line 10 yes

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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