Re: __isset() and null value

Yes, this is purely to offer native/php support for it. When implementing custom ORM etc., we do not have any control over the class, ie. extra method for checking property existance is not possible. With kind regards / Mit freundlichen Grüßen / S přátelským pozdravem, Michael Voříšek, student On 4 Sep 2020 20:14, David Rodrigues wrote:

Maybe you just can implements your own method to check? Like your exists() example. Em sex, 4 de set de 2020 15:08, Michael Voříšek - ČVUT FEL < vorismi3@fel.cvut.cz> escreveu: Your examples provide code for checking the existance of real properties. But how to check existance of a magic one? The best is currently __isset(), but to comply with isset() definition, it should not return true when the magic property has null value, thus I belive, there is currently not way (provided by php language) to check for existance of magic property. With kind regards / Mit freundlichen Grüßen / S přátelským pozdravem, Michael Voříšek On 4 Sep 2020 19:23, Marco Pivetta wrote: Heya, On Fri, Sep 4, 2020 at 7:03 PM Michael Voříšek - ČVUT FEL < vorismi3@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

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

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/