Problems with syntax in PHP

Question

I have an object and can access one of its properties by

$book = new Book(); print $book->price;

I can also call

 $prop = "price"; print $book->$prop.

But I cannot figure out how to call in a mixed way, it gives error:

$book->id_$prod

as a shortened of $book->id_products, being $prod = "products".

score 1 · Answer 1 · answered Apr 28 '16 at 14:53

1

Mix the 2 first options.

$prop = 'id_'.$prod;
$book->$prop;

answered Apr 28 '16 at 14:53

Jonnix

That is trivial. I meant a direct way with some trick. For example {"id_" . $prod} or something. – Cesar Apr 28 '16 at 14:58
It seems it works: $book->{"id_" . $prod} – Cesar Apr 28 '16 at 15:00

score 1 · Accepted Answer · answered Apr 28 '16 at 14:54

1

$book = new Book(); 
$id_prod = "id_$prod";
print $book->$id_prod;

answered Apr 28 '16 at 14:54

Tudor Constantin

Is this the only way? No possibility of using {} or something? It reminds me of dereferencing of objects, like $object->method()[0] which was incorrect until PHP 5.4 I think, you should make $tmp =$object->method(), and later access $tmp[0]. – Cesar Apr 28 '16 at 14:57
yes, you could also do print $book->{"id_$prod"}; – Tudor Constantin Apr 28 '16 at 15:03

2 Answers2