Get all possible value (dropdown options) of a product attribute in Magento.

all_attribute_options

<?php
  //Possible color value
  $attribute = Mage::getModel('eav/config')->getAttribute('catalog_product', 'color'); //"color" is the attribute_code
  $allOptions = $attribute->getSource()->getAllOptions(true, true);
  foreach ($allOptions as $instance) {
    $id = $instance['value']; //id of the option
    $value = $instance['label']; //Label of the option
  }
?>

Thanks a lot ... It works...

can someone say where is the definition for getAllOptions()? Is it possible to rewrite this method. i was to pass custom filter options which should be independent of any layered navigation plugin.?

Would this be part of the install script, I'm still struggling to get it to pop up on my frontend. Also, can this also apply to a multi select option.

how to do same it with Magento 2?