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To: Ryan Pallas <derokorian@gmail.com>, Matt Fonda <matthewfonda@gmail.com>
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Date: Wed, 1 Jun 2016 19:38:37 +0200
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Subject: Re: [PHP-DEV] Set object properties inline
From: php@fleshgrinder.com (Fleshgrinder)

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Subject: Re: [PHP-DEV] Set object properties inline
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On 6/1/2016 5:47 PM, Ryan Pallas wrote:
> On Wed, Jun 1, 2016 at 9:37 AM, Matt Fonda <matthewfonda@gmail.com> wro=
te:
>>
>>
>> Hi Jesse,
>>
>> It's fairly straightforward to implement a function that does this in
>> userland, for example something like the following:
>>
>> function f($fqcn, $args) {
>>     $instance =3D new $fqcn;
>>     foreach ($args as $key =3D> $value) {
>>         $instance->$key =3D $value;
>>     }
>>     return $instance;
>> }
>> ...
>> $this->fooMethod(
>>     $arg1,
>>     $arg2,
>>     f('FooParams', [
>>         'prop1' =3D> ...,
>>         'prop2' =3D> ...,
>>         'prop3' =3D> f('Obj1', [
>>             'prop1' =3D> ...,
>>             'prop2' =3D> ...,
>>         ],
>>     ])
>> );
>>
>> You may also use the approach Peter suggested. As such, I don't think
>> introducing a new syntax for it is necessary.
>>
>=20
> I disagree here. This lets you add dynamic properties accidentally (by
> putting too many entries in the array or misspelling a property as a ke=
y),
> this method does not let IDEs help you with the construction of the arr=
ay,
> or even what's valid for each value in that array and doesn't provide a=
ny
> language level protection against misspelled properties. Of course, for=
 the
> last point, I'm assuming that this idea works like the following:
>=20
> class Foo {
>    public $prop1;
> }
>=20
> new Foo () {
>     porp1 =3D 'foo' // undefined property error of some sort
> };
>=20
>=20
>> Best,
>> --Matt
>>
>=20

Still generically solvable in userland with creativity. :)

  trait ObjectFromArray {

    public static function fromArray(array $array, ...$params) {
      $object =3D new static(...$params);

      foreach ($array as $k =3D> $v) {
        if (property_exists($object, $k)) {
          $object->{$k} =3D $v;
        }
        else {
          trigger_error('fubar', E_USER_ERROR);
        }
      }

      return $object;
    }

  }

  class SomeObject {
    use ObjectFromArray;

    private $foo;

  }

  SomeObject::fromArray(['foo' =3D> 'bar', 'bar' =3D> 'foo']);

--=20
Richard "Fleshgrinder" Fussenegger


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