合并两个对象并覆盖空属性（PHP）

Question

I have two objects and the way our finder function works (I have to call it twice... 1 to get the config key, value i.e. non multilanguage stuff. And the second call to get the multilanguage stuff) makes them look like this:

[config] => Array
    (
        [cfg] => Config_Model Object
            (
                [id] => 2
                [key] => system.default.main_color
                [value] => #FF7C11
                [deleted] => 0
            )

        [help] => Config_Model Object
            (
                [id] => 
                [key] => 
                [value] => 
                [id_config] => 2
                [name] => Hauptfarbe
                [help] => Die Hauptfarbe Ihres CIs. Der Adminbereich erscheint in dieser Farbe.
                [id_lang] => 1
            )

    )

I want to compine these two objects into one. The code, that gets the stuff looks like this:

public static function get($key)
{
  $config['cfg'] = self::find(array('key' => $key), TRUE);
  $config['help'] = self::findInTable(array(
    'id_lang' => Language_Model::getDefaultLanguage(), 
    'id_config' => $config['cfg']->getId()
  ), self::dbTranslationTable, TRUE);
  return $config;
  // return (object) array_merge((array) $config['cfg'], (array) $config['help']);
}

You can tell by the commented return command, that I tried using array_merge(). The problem with that is, that the empty attributes from [help] override the attributes from [cfg], so they are empty again:

[config] => stdClass Object
    (
        [id] => 
        [key] => 
        [value] => 
        [deleted] => 0
        [id_config] => 2
        [name] => Hauptfarbe
        [help] => Die Hauptfarbe Ihres CIs. Der Adminbereich erscheint in dieser Farbe.
        [id_lang] => 1
    )

Whereas it should rather look like this:

[config] => stdClass Object
    (
        [id] => 2
        [key] => system.defalult.main_color
        [value] => #FF7C11
        [deleted] => 0
        [id_config] => 2
        [name] => Hauptfarbe
        [help] => Die Hauptfarbe Ihres CIs. Der Adminbereich erscheint in dieser Farbe.
        [id_lang] => 1
    )

If you need more information, please let me know.

Answer 1

You need to filter out empty values from your second array, and then merge only what's left onto the first array.

The simplest solution would be:

$config['help'] = array_filter((array) $config['help']);
return (object) array_merge((array) $config['cfg'], (array) $config['help']);

This uses the default behaviour of array_filter(), which just checks whether the values evaluate to false. This will remove empty strings, NULL values, or even the number zero.

A safer solution will actually check for empty strings, like this:

$config['help'] = array_filter((array) $config['help'], function($val) {
    return (string) $val != '';
});
return (object) array_merge((array) $config['cfg'], (array) $config['help']);