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При получении getLastId();

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При получении getLastId() из другой функции первое значение у меня выходит NULL  !!

К примеру вот в данной функции я передаю в переменную полученный id

	public function addProductRelated(&$product_id_related, &$dataRelated) {

	$sql = '';

		$sql = 'INSERT INTO `' . DB_PREFIX . 'product` SET ' . $sql;
		$product_id_related = $this->db->getLastId();	

		if (isset($this->setting['product_store'])) {
			foreach ($this->setting['product_store'] as $store_id) {
				$this->db->query('INSERT INTO `' . DB_PREFIX . 'product_to_store` SET product_id = \'' . (int)$product_id_related . '\', store_id = \'' . (int)$store_id . '\'');
		if(!$product_id_related) return FALSE;
		$sql = '';

		if(isset($this->field_caption['_NAME-RELATED_'])) {
			$sql .= ' name = REPLACE(\'' . $this->db->escape($dataRelated[$this->field_caption['_NAME-RELATED_']]) . '\', \'"\', \'"\'),';

$this->product_id_related_new = $product_id_related; //вот имеено тут !!!!!!!!
			return true;

B и вывожу его в другой функции  !

$get_product_id_related = $this->product_id_related_new;

echo "<pre>";		
echo "</pre>";

и получаю результат  !

Первое значение у меня NULL 
Но если я буду выводить данный getLastId() в самой функции то проблем у меня нет  !

Edited by Sabufer
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1 минуту назад, spectre сказал:

ну а 



Всмысле обьявлен типо так что ли ?? 
$this->product_id_related_new = $product_id_related; //вот имеено тут !!!!!!!!

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2 часа назад, spectre сказал:


как-то так


и вы ошибочно полагаете что я вам что-то должен


вот это понятный пример 

class Test
  public $some_property = '123';

$obj = new Test;
var_dump( $obj->some_property )

class Test
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