Array class property

Question

This code gives the error "unexpected '.', expecting ')'". Why is this invalid? I'd thought that as both parts are constant, I could concatenate them. New to PHP. Thanks.

class c {
  const HELLO = 'hello';
  public $arr = array(
    'hw' => self::HELLO . 'world'
  );
}

possible duplicate of Workaround for basic syntax not being parsed — mario
– mario, Commented Dec 21, 2011 at 2:01
you should accept the answer below to reward the person who helped you. :) — Tim G
– Tim G, Commented Dec 21, 2011 at 2:27

user142162 · Accepted Answer · 2011-12-21 01:59:38Z

6

Class properties must have constant initial values. The concatenation of those two strings is NOT a constant value.

From the documentation:

[Property] declaration may include an initialization, but this initialization must be a constant value -- that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.

You could put the property initialisation in your constructor:

public function __construct()
{
  $this->arr = array(
    'hw' => self::HELLO . 'world'
  );
}

answered Dec 21, 2011 at 1:59

user142162

Sign up to request clarification or add additional context in comments.

1 Comment

idoimaging Over a year ago

Thanks. I had thought it would be constant. Though I do now see the point that the operator makes it an expression.

Collectives™ on Stack Overflow

Array class property

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related