displaying lowest starting from product price on opencart - php

Question

Instead of having a base price on the product and displaying that I want to set the base price as 0.00 and display the lowest costing option price i.e
Polo shirt price = 0
Small = £10
Medium = £15
Large = £20
and it should display Starting from £10
Currently on the product page it displays price as 0 until and option is selected
<?php echo $price; ?>
I want it to do something like this but i am unsure of the syntax
<?php $min_value [] = $options['option_value']; ?>
<?php $min_value_price [] = $min_value['price']; ?>
<?php $min = min($min_value_price); ?>
<?php echo $min; ?>
Is this somewhere along the right lines? Currently it doesn't display anything with the above code
Model
public function getProductOptions($product_id) {
$product_option_data = array();
$product_option_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_option po LEFT JOIN `" . DB_PREFIX . "option` o ON (po.option_id = o.option_id) LEFT JOIN " . DB_PREFIX . "option_description od ON (o.option_id = od.option_id) WHERE po.product_id = '" . (int)$product_id . "' AND od.language_id = '" . (int)$this->config->get('config_language_id') . "' ORDER BY o.sort_order");
foreach ($product_option_query->rows as $product_option) {
if ($product_option['type'] == 'select' || $product_option['type'] == 'radio' || $product_option['type'] == 'checkbox' || $product_option['type'] == 'image') {
$product_option_value_data = array();
$product_option_value_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_option_value pov LEFT JOIN " . DB_PREFIX . "option_value ov ON (pov.option_value_id = ov.option_value_id) LEFT JOIN " . DB_PREFIX . "option_value_description ovd ON (ov.option_value_id = ovd.option_value_id) WHERE pov.product_id = '" . (int)$product_id . "' AND pov.product_option_id = '" . (int)$product_option['product_option_id'] . "' AND ovd.language_id = '" . (int)$this->config->get('config_language_id') . "' ORDER BY ov.sort_order");
foreach ($product_option_value_query->rows as $product_option_value) {
$product_option_value_data[] = array(
'product_option_value_id' => $product_option_value['product_option_value_id'],
'option_value_id' => $product_option_value['option_value_id'],
'name' => $product_option_value['name'],
'image' => $product_option_value['image'],
'quantity' => $product_option_value['quantity'],
'subtract' => $product_option_value['subtract'],
'price' => $product_option_value['price'],
'price_prefix' => $product_option_value['price_prefix'],
'weight' => $product_option_value['weight'],
'weight_prefix' => $product_option_value['weight_prefix']
);
}
$product_option_data[] = array(
'product_option_id' => $product_option['product_option_id'],
'option_id' => $product_option['option_id'],
'name' => $product_option['name'],
'type' => $product_option['type'],
'option_value' => $product_option_value_data,
'required' => $product_option['required']
);
} else {
$product_option_data[] = array(
'product_option_id' => $product_option['product_option_id'],
'option_id' => $product_option['option_id'],
'name' => $product_option['name'],
'type' => $product_option['type'],
'option_value' => $product_option['option_value'],
'required' => $product_option['required']
);
}
}
return $product_option_data;
}
Controller
$this->data['options'] = array();
foreach ($this->model_catalog_product->getProductOptions($this- >request->get['product_id']) as $option) {
if ($option['type'] == 'select' || $option['type'] == 'radio' || $option['type'] == 'checkbox' || $option['type'] == 'image') {
$option_value_data = array();
foreach ($option['option_value'] as $option_value) {
if (!$option_value['subtract'] || ($option_value['quantity'] > 0)) {
if ((($this->config->get('config_customer_price') && $this->customer->isLogged()) || !$this->config->get('config_customer_price')) && (float)$option_value['price']) {
$price = $this->currency->format($this->tax->calculate($option_value['price'], $product_info['tax_class_id'], $this->config->get('config_tax')));
} else {
$price = false;
}
$option_value_data[] = array(
'product_option_value_id' => $option_value['product_option_value_id'],
'option_value_id' => $option_value['option_value_id'],
'name' => $option_value['name'],
'image' => $this->model_tool_image->resize($option_value['image'], 50, 50),
'price' => $price,
'price_prefix' => $option_value['price_prefix']
);
}
}
$this->data['options'][] = array(
'product_option_id' => $option['product_option_id'],
'option_id' => $option['option_id'],
'name' => $option['name'],
'type' => $option['type'],
'option_value' => $option_value_data,
'required' => $option['required']
);
} elseif ($option['type'] == 'text' || $option['type'] == 'textarea' || $option['type'] == 'file' || $option['type'] == 'date' || $option['type'] == 'datetime' || $option['type'] == 'time') {
$this->data['options'][] = array(
'product_option_id' => $option['product_option_id'],
'option_id' => $option['option_id'],
'name' => $option['name'],
'type' => $option['type'],
'option_value' => $option['option_value'],
'required' => $option['required']
);
}
}

Answer 1

Simply add the following code in controller inside first loops if condition Just after
$option_value_data = array(); around line 349.
if($option['option_id'] == your_option_id){
function cmp($a, $b)
{
return $b['price'] + $a['price'];
}
usort($option['option_value'], "cmp");
$this->data['min_price'] = $option['option_value'][0]['price'];
}
Replace your_option_id with required option ID you want.
Now in template file check if $min_price is set then echo $min_price else echo default price.
if(isset($min_price)){
echo $min_price;
......
}else{
echo $price
......
}

Answer 2

The problem here is the settings... Product should not have a price $0.0 while options are setting the product's price. Instead of this the product should have some price (You can use the lowest possible for the product) and options then only modify this base price:
T-shirt polo: $10.0
Small (S): +$0.0
Medium (M): +$1.0
Large (L): +$2.0
X-Large (XL): +$3.0
XX-Large (XXL): +$4.0
If Your store is selling products where options will always modify the price, You can then only check (in the template) whether the product has options, and in this case You can display something like Price: starting from $10.0, if the products has no options, display it like usual, e.g. Price: $10.0.
Or is there any big reason for setting the base price to 0.0?
Just my very own opinion: people don't like (in general) when a T-shirt (or any other piece of clothes) has different price regarding the size they need and moreover they can be discouraged when their size is more expensive. It is a good practice to calculate some average price for a T-shirt (or any other piece of clothes) and use this average price for all sizes. If I had to do that, I would expect to sell e.g. 20% of S, 30% of M and L, 15% of XL and 5% of XXL - then I could calculate the average price as 0.2 x 10 + 0.3 x 11 + 0.3 x 12 + 0.15 x 13 + 0.05 x 14 = 2 + 3.3 + 3.6 + 1.95 + 0.7 = 11.55. I will then use this average price for all sizes of this very shirt...

Answer 3

Maybe replace order in mysql query (model file)
$product_option_value_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_option_value pov LEFT JOIN " . DB_PREFIX . "option_value ov ON (pov.option_value_id = ov.option_value_id) LEFT JOIN " . DB_PREFIX . "option_value_description ovd ON (ov.option_value_id = ovd.option_value_id) WHERE pov.product_id = '" . (int)$product_id . "' AND pov.product_option_id = '" . (int)$product_option['product_option_id'] . "' AND ovd.language_id = '" . (int)$this->config->get('config_language_id') . "' ORDER BY ov.sort_order");
to
$product_option_value_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_option_value pov LEFT JOIN " . DB_PREFIX . "option_value ov ON (pov.option_value_id = ov.option_value_id) LEFT JOIN " . DB_PREFIX . "option_value_description ovd ON (ov.option_value_id = ovd.option_value_id) WHERE pov.product_id = '" . (int)$product_id . "' AND pov.product_option_id = '" . (int)$product_option['product_option_id'] . "' AND ovd.language_id = '" . (int)$this->config->get('config_language_id') . "' ORDER BY pov.price ASC");
ov.sort_order >>
pov.price ASC
or
ov.sort_order >>
pov.price DESC