OpenCart Community

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foreach ($products as $product) {
			$product_total = 0;

			foreach ($products as $product_2) {
				if ($product_2['product_id'] == $product['product_id']) {
					$product_total += $product_2['quantity'];
				}
			}

			if ($product['minimum'] > $product_total) {
				$this->response->redirect($this->url->link('checkout/cart'));
			}
		}

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$error_quantity = array();
		
// Change to any value you want above 0.
$value = 6;

$this->load->model('catalog/product');

foreach ($products as $product) {
	$product_total = 0;

	foreach ($products as $product_2) {
		if ($product_2['product_id'] == $product['product_id']) {
			$product_total += $product_2['quantity'];
		}
	}

	if ($product['minimum'] > $product_total) {
		$this->response->redirect($this->url->link('checkout/cart'));
	}
	
	$product_to_categories = $this->model_catalog_product->getCategories($product['product_id']);
	
	if ($product_to_categories) {
		foreach ($product_to_categories as $p2c) {
			$p2c_data = array('category_id'		=> $p2c['category_id'],
							  'product_id'		=> $p2c['product_id']
							 );
		
			$error_quantity[$product['quantity']][json_encode($p2c_data)] = true;
		}
	}
}
		
if (!empty($value) && $error_quantity) {
	// Modify the two categories to the values you want.
	$categories = array(1, 2);
	
	$this->session->data['error_quantity'] = array();
	
	foreach ($error_quantity as $quantity => $p2cs) {
		if ($quantity < $value) {
			$p2c_data = json_decode($p2cs, true);
			
			if (!empty($p2c_data['category_id']) && in_array($p2c_data['category_id'], $categories)) {
				$this->session->data['error_quantity'][$p2c_data['product_id']] = sprintf($this->language->get('error_max_quantity'), $quantity, $value);
			}
		}
	}
}

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$value = 6;

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$categories = array(1, 2);

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$_['error_max_quantity']			 = 'There are %s product(s) added on the cart. The maximum product(s) allowed are %s!';

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if ($this->config->get('config_customer_price') && !$this->customer->isLogged()) {

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if (!empty($this->session->data['error_quantity'])) {
				$data['error_quantity'] = $this->session->data['error_quantity'];
				
				unset ($this->session->data['error_quantity']);
			} else {
				$data['error_quantity'] = '';
			}

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'cart_id'   	=> $product['cart_id'],

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'product_id'	=> $product['product_id'],

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<span class="label label-info">{{ text_recurring_item }}</span> <small>{{ product.recurring }}</small> {% endif %}</td>

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<span class="label label-info">{{ text_recurring_item }}</span> <small>{{ product.recurring }}</small> {% endif %}
				{% if error_quantity[product.product_id] %}
					<br />					
					<div class="text-danger">{{ error_quantity[product.product_id] }}</div>
				{% endif %}</td>

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unset($this->session->data['totals']);

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if (!empty($this->session->data['error_quantity'])) {
	unset ($this->session->data['error_quantity']);
}