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I have a public function in php page like this

public function _getProductID($id_product)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT `id_product` FROM `'._DB_PREFIX_.'packing_product` WHERE `id_product` = '.(int)$id_product);
	}

public function hookDisplayProductAdditionalInfo($params)
    {
		$id_shop 	= Context::getContext()->shop->id;
		$products = $this->_getProducts($id_shop);
		$this->context->smarty->assign([
				'products' =>$products,
				'page' =>$this,
		]);
		return $this->display(__FILE__, 'product.tpl');
	}

I also have a .tpl file (product.tpl) with a script like this

{foreach from=$products item=p}
     {assign var='id_Product' value=$page->_getProductID($p.id_product)}
{/foreach}

but the result is an error with notes like this:

Fatal error: Uncaught Error: Cannot use object of type Extlink as array in

however in the back office page it works fine..

Which script code do I need to fix?

I have a public function in php page like this

public function _getProductID($id_product)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT `id_product` FROM `'._DB_PREFIX_.'packing_product` WHERE `id_product` = '.(int)$id_product);
	}

public function hookDisplayProductAdditionalInfo($params)
    {
		$id_shop 	= Context::getContext()->shop->id;
		$products = $this->_getProducts($id_shop);
		$this->context->smarty->assign([
				'products' =>$products,
				'page' =>$this,
		]);
		return $this->display(__FILE__, 'product.tpl');
	}

I also have a .tpl file (product.tpl) with a script like this

{foreach from=$products item=p}
     {assign var='id_Product' value=$page->getProductID($p.id_product)}
{/foreach}

but the result is an error with notes like this:

Fatal error: Uncaught Error: Cannot use object of type Extlink as array in

however in the back office page it works fine..

Which script code do I need to fix?

I have a public function in php page like this

public function getProductName($id_product)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('SELECT `id_product` FROM `'._DB_PREFIX_.'packing_product` WHERE `id_product` = '.(int)$id_product);
	}

public function hookDisplayProductAdditionalInfo($params)
    {
		$id_shop 	= Context::getContext()->shop->id;
		$products = $this->_getProducts($id_shop);
		$this->context->smarty->assign([
				'products' =>$products,
				'page' =>$this,
		]);
		return $this->display(__FILE__, 'product.tpl');
	}

I also have a .tpl file (product.tpl) with a script like this

{foreach from=$products item=p}
     {assign var='id_Product' value=$page->getProductExtlink($p.id_product)}
{/foreach}

but the result is an error with notes like this:

Fatal error: Uncaught Error: Cannot use object of type Extlink as array in

however in the back office page it works fine..

Which script code do I need to fix?