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@ 2015-05-01T16:48:58Z

<?php

$entity = new stdClass();
$entity->price['und'][] = array('amount' => 0, 'currency_code' => 'CAD', 'data' => FALSE);
$entity->price2['und'][] = array('amount' => 0, 'currency_code' => 'CAD', 'data' => FALSE);

function compare_filter($field, $array) {
  foreach ($array as $language => $items) {
    if (empty($items)) {
      unset($array[$language]);
    }
    else {
      foreach ($items as $delta => $item) {
        $array[$language][$delta] = array_filter(array_intersect_key($item, $field['columns']));
        ksort($array[$language][$delta]);
      }
    }
  }
  return $array;
}

$field['columns'] = array('amount' => array(), 'currency_code' => array(), 'data' => array());
foreach (array('price', 'price2') as $field_name) {
    $items1 = compare_filter($field, (array) $entity->$field_name);
}

var_dump($entity);

Output for git.master, git.master_jit, rfc.property-hooks: object(stdClass)#1 (2) { ["price"]=> array(1) { ["und"]=> array(1) { [0]=> array(3) { ["amount"]=> int(0) ["currency_code"]=> string(3) "CAD" ["data"]=> bool(false) } } } ["price2"]=> array(1) { ["und"]=> array(1) { [0]=> array(3) { ["amount"]=> int(0) ["currency_code"]=> string(3) "CAD" ["data"]=> bool(false) } } } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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