array_column 在 PHP 5.6 中返回空数组 [重复]

Question

在使用 Yii1 框架和 PHP 5.6.40 的生产环境中，array_column 函数返回一个空数组。

该数组是来自另一个 CActiveRecord 的 HAS_MANY 关系的 CActiveRecord 列表。在我的本地机器 (PHP 7.1.23) 上，array_column 函数按预期工作。除非我误解，documentation 表示 array_column 在 PHP 5.6.40 中可用。

/**
 * This is the model class for table 'my_active_record'.
 *
 * The following are the available columns in table 'my_active_record':
 * @property integer $id
 *
 * The following are the available model relations:
 * @property RelatedActiveRecord[] $relatedActiveRecords
 */
class MyActiveRecord extends CActiveRecord
{
    public function relations()
    {
        return array(
            'relatedActiveRecords' => array(self::HAS_MANY, 'related_active_records', 'my_active_record_id')
        );
    }
}

/**
 * This is the model class for table 'related_active_record'.
 *
 * The following are the available columns in table 'related_active_record':
 * @property integer $id
 * @property integer $my_active_record_id
 *
 * The following are the available model relations:
 * @property MyActiveRecord $myActiveRecord
 */
class MyActiveRecord extends CActiveRecord
{
    public function relations()
    {
        return array(
            'myActiveRecord' => array(self::BELONGS_TO, 'my_active_record', 'my_active_record_id')
        );
    }
}

$myActiveRecord = new MyActiveRecord();
print_r(array_column($myActiveRecord->relatedActiveRecords, 'id'));

预期结果：Array ( [0] => 1 [1] => 2 [2] => 3 ) 实际结果：Array ( ).

Answer 1

版本说明 7.0.0 新增输入参数为对象数组的功能。