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Sorry, this is a super stupid problem but I'm new to PHP and failed at solving it myself.

On my node I have an energy field (Radioactivity module) and a computed field. The computed field is supposed to read out the node's current energy, plug it into a function and return another value.

I have tried all of

float( $entity->field_energy ),

float( $entity->field_energy[0]['value'] ), and

float( array_pop(array_pop(field_get_items($entity_type, $entity, 'field_energy'))) )

to read out the node's current energy, but everythings gives me an error. When I replace the above with a static number everything works fine.

Can anyone tell me how to read out the energy? I don't even know what data type is used to store the energy.

(I couldn't add a radioactivity tag. Unfortunately I don't have enough reputation points for doing so.)

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1 Answer 1

Reset to default
3

My guess is that it is something like

float($entity->field_energy['und'][0]['value']);

Also, you can do 

print_r ($entity->field_energy);

to see what is contained in object.

also, it may be contained in node object so maybe it is

float($node->field_energy['und'][0]['value']);

My blind guess but it may help you :)

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    Just to avoid future issues with translations or new languages setup use it like this: float($node->field_energy[$node->language][0]['value']);
    – Emil Orol
    Commented Oct 1, 2012 at 13:30
  • redhatlab, excellent remark, i read from default value for simplicity (no language iterations), but your approach is better. Though, one could search through documents and replace all occurances of ['und'] when switching to multilanguage :D
    – NenadP
    Commented Oct 1, 2012 at 13:58
  • In addition, you can download/enable the [Devel Module] (drupal.org/project/devel) and call kpr() on your $node or $entity object. This is functionally the same as calling print_r, but provides a nicer output style.
    – joedougherty
    Commented Oct 1, 2012 at 15:30
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    Thanks for your help guys! This worked perfectly. I used print_r to display the field_energy array and noticed that the values are not stored with integer keys but rather with text keys. It turned out that I have to use $entity->field_energy['und'][0]['radioactivity_energy']. For some reason applying float() to this gives me an error though. But if I don't apply float() I can still use the value as a real number.
    – deinqwertz
    Commented Oct 1, 2012 at 17:58
  • try: floatval($entity->field_energy['und'][0]['radioactivity_energy'])
    – Emil Orol
    Commented Oct 2, 2012 at 2:29

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