Heya, <http://ocramius.github.com/>
On Fri, Sep 4, 2020 at 7:03 PM Michael Voříšek - ČVUT FEL < voris...@fel.cvut.cz> wrote: > isset() returns false for null > > __isset() should return the same, but then if magic property with null > value exists, there is no way to detect it > > Example: https://3v4l.org/GqUsh > > this is currently an limitation of php > > Ideally, we should introduce __exist() which should return true even if > value is null and for BC autoimplement __isset() based on it and __get, > ie. > > function __isset($n) { return $this->__exist($n) && $this->__isset($n) > !== null; } > I'd endorse **NOT** checking for property existence on objects that don't have a clearly defined interface/type: that's something for a static analyzer, not (usually) for runtime code. If you still need to do that (anti-patterns such as stuffing things in `stdClass` instances), checking if a property is defined is trivial with reflection: ```php <?php class SomethingMagicAndTerriblyUgly { public $foo = null; private $bar = null; } var_dump((new ReflectionClass(SomethingMagicAndTerriblyUgly::class))->hasProperty('foo')); var_dump((new ReflectionClass(SomethingMagicAndTerriblyUgly::class))->hasProperty('bar')); var_dump((new ReflectionClass(SomethingMagicAndTerriblyUgly::class))->hasProperty('baz')); ``` https://3v4l.org/pVC4j Checking if a **public** property exists at runtime is done via `array_key_exists()`, not via `isset()`: ```php <?php class SomethingMagicAndTerriblyUgly { public $foo = null; private $bar = null; } var_dump(array_key_exists('foo', (array) (new SomethingMagicAndTerriblyUgly))); var_dump(array_key_exists('bar', (array) (new SomethingMagicAndTerriblyUgly))); ``` https://3v4l.org/ZLSjq Marco Pivetta http://twitter.com/Ocramius http://ocramius.github.com/
