PHP retrieve an object value by reference where the reference contains a variable and a hyphen

Question

So I am trying to target an object like this:

$subject = $obj->$field->{'$postID-subject'};

I always get a returned value of 0. Any thoughts?

@RiggsFolly thing when $postID = 23 then `23-subject` is the field name — JustOnUnderMillions, Jul 12 '16 at 15:20
@JustOnUnderMillions Except `-` (hyphen) is not allowed in a PHP variable name and therefore also not in a property name — RiggsFolly, Jul 12 '16 at 15:20
@RiggsFolly Not allowed, but also not freally forbidden `$a = new stdClass(); $a->{"A-A"} = 'B'; print $a->{"A-A"};` — JustOnUnderMillions, Jul 12 '16 at 15:22
Hopefully that `$obj` has any 'XX-subject' field in it, anywhere! :))) — JustOnUnderMillions, Jul 12 '16 at 15:29
@JustOnUnderMillions *"That is also funny"*; We don't want to get serious here, [**ಠ_ಠ**](https://3v4l.org/NJJjO) right ? :) — Rizier123, Jul 12 '16 at 15:33

score 2 · Accepted Answer · edited Jul 12 '16 at 15:32

2

Try that:

  $field2 ="{$postID}-subject";
  $subject = $obj->$field->$field2;

Proof of concept:

 $a = new stdClass(); 
 $a->{"A-A"} = 'B'; 
 print $a->{"A-A"};

:)

edited Jul 12 '16 at 15:32

RiggsFolly

answered Jul 12 '16 at 15:31

`Try that` answers get dropped in the list even below an answer with -2 A bit of explanation with lift you above at least one of those millions – RiggsFolly Jul 12 '16 at 15:40

1 Answers1