I'm using a template engine that inserts code in my site where I want it.

I wrote a function to test for something which is quite easy:

myfunction() { return '($this->data["a"]["b"] ? true : false)'; }

The problem is, $this->data is private, and I can't access it everywhere, so I have to use getData(); which causes my problem.

$this->getData()['a']['b']

does not work, and assigning the value first doesn't either because it will be used directly in an if() block.

Any ideas?

Solution 1

Since PHP 5.4 it's possible to do exactly that:

getSomeArray()[2]

Reference: https://secure.php.net/manual/en/language.types.array.php#example-62

On PHP 5.3 or earlier, you'll need to use a temporary variable.

Solution 2

You cannot use something like this :

$this->getData()['a']['b']

ie, array-access syntax is not possible directly on a function-call.

Youy have to use some temporary variable, like this :

$tmp = $this->getData();
$tmp['a']['b']    // use $tmp, now

In your case, this probably means using something like this :

function myfunction() {
  $tmp = $this->getData();
  return ($tmp['a']['b'] ? true : false);
}

You have to :

  • first, call your getData() method, and store its return value in a temporary varibale
  • then, use that temporary variable for your test

You don't have much choice about that, actually...

Solution 3

Ok... apparently there really isn't a better way, so I'm going to answer myself with a not so beautiful solution:

I created the function:

arrayGet($array, $index) { return $array[$index]; }

And used it like this:

myfunction() { return '(arrayGet(arrayGet($this, "a"), "b") ? true : false)' }

This is not pretty but works.

Solution 4

$this->data is always accessible, if it is protected. $object->data is not accessible from everywhere, so if you're returning $this in your code, and it is evaluated as such, it should be ok.

Btw, there is a bug in your code: The quotes need to be escaped.

myfunction() { return '($this->data[\'a\'][\'b\'] ? true : false)'; }

Solution 5

It is possible from PHP version 5.4.

If you don't want a temporary variable for that and your PHP version is less, than 5.4, than you still can use a few built in functions to get the first or the last element:

$x     = 'first?last';
$first = array_shift(explode('?', $x));
$last  = end(explode('?', $x));
$last2 = array_pop(explode('?', $x));

Edit: !!! Please note, that in later versions( 5.4+ ) PHP will throw a notice, because end only expects variables as parameter.